I am writing a script which will take users input and then run following command in new terminal.
I am working on bigger "script", but for testing I created this little version of my problem.
newtermtest.sh
okegreen='\033[92m'
while true
read -p "Input Selection: " mainmenuinput
do
#find the name of instaled terminal then run new window of it and run bash in it !
#on my computer I have instaled x-terminal-emulator: so testing on it ---- NOT WORKING YET
case $mainmenuinput in
"0")
x-terminal-emulator -e "bash -c 'nmap -sV -sC 189.55.23.174 -vvv'"
;;
"1")
path=$(pwd)
x-terminal-emulator -e "bash -c 'cd $path;touch silk.txt'"
;;
*)
break;
esac
done
echo -e "${okegreen}leaving programe..."
I have found that something like x-terminal-emulator -e {command} should work, but when I run it I have the following error and the screen just flashes.
returned message:
QDir::exists: Empty or null file name
Then I would need something to keep the terminal up, I found --noclose or -hold tags, but I can't test it util I find the working command.
Do you have some experiences with opening new terminal from bash script ?
Iam opened for any hints.
Some temporary solution which works now:
x-terminal-emulator -e 'nmap -sV -sC 189.55.23.174 -vvv'
I used just -e to execute command and with nmap it is working now.
I will figure out other commands and I will try to put it in complex script with more types of terminals.
Thanks All for suggestions.
As the question specifics ,i am getting this error while executing my bash script
In exact terms i get following error
bash: line 26: /dev/tty: No such device or address
bash: line 29: /dev/tty: No such device or address
Here are the concerned Line 26 and 29 in script respectively which causes the issue
read -e -p "Paste the links : " links </dev/tty
read -e -p "Enter your input : " sub </dev/tty
If someone wonders, i cannot simply remove writing to </dev/tty from line 26 and 29 , it causes different issues .. So basically i need fix or get alternative for writing to /dev/tty
I am executing my script by running -
curl raw_link | bash
Preferably i want a solution which only requires me to my edit my existing script .i don't want to run the script after saving it locally or execute it using any other way apart from curl raw_link | bash
ls -l /dev/tty returns the following
crw-rw-rw- 1 root root 5, 0 Aug 8 09:28 /dev/tty
ls -l </dev/tty returns the following
/bin/bash: /dev/tty: No such device or address
Also i would like to mention that this issue doesn't seem to be happening on every machine , i intend to use this script on Google Colab where i definitely do get this issue
To fix the bash error, you can try this workaround :
tty=$(readlink /proc/$$/fd/2)
read ... < $tty
$tty contains the actual tty device name.
I stumpled upon a strange behaviour that I can not explain. I tried to narrow down the problem. I have the following test testscript.sh script:
echo before
adb shell ls
echo after
If I run the script with bash -x testscript.sh, everything works as expected and I get the following output:
+ echo before
before
+ adb shell ls
acct
bin
bugreports
...
sdcard
storage
sys
system
ueventd.rc
vendor
+ echo before
before
But if I run the script as piped script with cat testscript.sh | bash -sx, I get the following output:
+ echo before
before
+ adb shell ls
acct
bin
bugreports
...
sdcard
storage
sys
system
ueventd.rc
vendor
The last echo after is not executed, and I can not figure out why. The script is running on an Ubuntu server 18.04. The adb is the one from the official Ubuntu package.
$ adb --version
Android Debug Bridge version 1.0.39
Version 1:8.1.0+r23-5~18.04
Installed as /usr/lib/android-sdk/platform-tools/adb
$ bash --version
GNU bash, version 4.4.20(1)-release (x86_64-pc-linux-gnu)
Please could someone enlight me, what is happening here.
When you run a script with bash scriptname, standard input of all the commands it runs is still connected to the terminal. So adb will read its standard input from the terminal.
When you redirect the input of bash, this redirection is inherited by adb. Unless you use the -n option to adb shell, it will read additional input from standard input and send it to the remote system as possible input for the command you run (it doesn't know that ls doesn't read standard input).
Change it to
adb shell -n ls
I am trying to check if a program is installed on a linux system by comparing command output with an expected output. I expect the program not to be present and so if program is abc then I should see:
bash: abc: command not found
But instead I am getting this output:
Shell for this session: bash
./checkprogs.sh: line 17: [: too many arguments
addgroup feature enabled test 1
./checkprogs.sh: line 15: tftp: command not found
./checkprogs.sh: line 17: [: too many arguments
tftp feature enabled test 2
2 tests performed
Here is the bash code:
ourshell="/bin/bash"
ourshell=${ourshell#*bin/}
echo "Shell for this session: $ourshell"
counter=1
# list of programs we want to test if available
progs='addgroup tftp'
for prog in $progs
do
expected="$ourshell: $prog: command not found"
#echo "$expected"
progoutput=$($prog -h)
#echo "prog output is: $progoutput"
if [ $expected != $progoutput ]
then
echo "test failed"
fi
echo "$prog feature enabled test $counter"
((counter++))
done
((counter--))
echo "$counter tests performed"
How can I fix this?
On the system I am working on, the shell is bash and addgroup is present but tftp is not.
Please note that I am on an embedded platform and "expect" is not installed. Assume minimal linux installation.
EDIT:
had to add space after [ and before ] - but even after fixing that still doesn't work as expected.
EDIT:
sorry I am new to bash scripting...
If I quote the strings inside [ ] and add 2>&1 to progoutput then code looks like this:
progoutput=$($prog -h 2>&1) # line 15
if [ "$expected" != "$progoutput" ] # line 17
and just so anyone can try this:
progs='ls invalidxxx' # line 9
then output is:
Shell for this session: bash
test failed
ls feature enabled test 1
test failed
invalidxxx feature enabled test 2
2 tests performed
actual method of string comparison
if [ "$expected" != "$progoutput" ]
or
if [[ $expected != $progoutput ]]
I am trying to write a shell script that creates some directories on a remote server and then uses scp to copy files from my local machine onto the remote. Here's what I have so far:
ssh -t user#server<<EOT
DEP_ROOT='/home/matthewr/releases'
datestamp=$(date +%Y%m%d%H%M%S)
REL_DIR=$DEP_ROOT"/"$datestamp
if [ ! -d "$DEP_ROOT" ]; then
echo "creating the root directory"
mkdir $DEP_ROOT
fi
mkdir $REL_DIR
exit
EOT
scp ./dir1 user#server:$REL_DIR
scp ./dir2 user#server:$REL_DIR
Whenever I run it I get this message:
Pseudo-terminal will not be allocated because stdin is not a terminal.
And the script just hangs forever.
My public key is trusted on the server and I can run all the commands outside of the script just fine. Any ideas?
Try ssh -t -t(or ssh -tt for short) to force pseudo-tty allocation even if stdin isn't a terminal.
See also: Terminating SSH session executed by bash script
From ssh manpage:
-T Disable pseudo-tty allocation.
-t Force pseudo-tty allocation. This can be used to execute arbitrary
screen-based programs on a remote machine, which can be very useful,
e.g. when implementing menu services. Multiple -t options force tty
allocation, even if ssh has no local tty.
Also with option -T from manual
Disable pseudo-tty allocation
Per zanco's answer, you're not providing a remote command to ssh, given how the shell parses the command line. To solve this problem, change the syntax of your ssh command invocation so that the remote command is comprised of a syntactically correct, multi-line string.
There are a variety of syntaxes that can be used. For example, since commands can be piped into bash and sh, and probably other shells too, the simplest solution is to just combine ssh shell invocation with heredocs:
ssh user#server /bin/bash <<'EOT'
echo "These commands will be run on: $( uname -a )"
echo "They are executed by: $( whoami )"
EOT
Note that executing the above without /bin/bash will result in the warning Pseudo-terminal will not be allocated because stdin is not a terminal. Also note that EOT is surrounded by single-quotes, so that bash recognizes the heredoc as a nowdoc, turning off local variable interpolation so that the command text will be passed as-is to ssh.
If you are a fan of pipes, you can rewrite the above as follows:
cat <<'EOT' | ssh user#server /bin/bash
echo "These commands will be run on: $( uname -a )"
echo "They are executed by: $( whoami )"
EOT
The same caveat about /bin/bash applies to the above.
Another valid approach is to pass the multi-line remote command as a single string, using multiple layers of bash variable interpolation as follows:
ssh user#server "$( cat <<'EOT'
echo "These commands will be run on: $( uname -a )"
echo "They are executed by: $( whoami )"
EOT
)"
The solution above fixes this problem in the following manner:
ssh user#server is parsed by bash, and is interpreted to be the ssh command, followed by an argument user#server to be passed to the ssh command
" begins an interpolated string, which when completed, will comprise an argument to be passed to the ssh command, which in this case will be interpreted by ssh to be the remote command to execute as user#server
$( begins a command to be executed, with the output being captured by the surrounding interpolated string
cat is a command to output the contents of whatever file follows. The output of cat will be passed back into the capturing interpolated string
<< begins a bash heredoc
'EOT' specifies that the name of the heredoc is EOT. The single quotes ' surrounding EOT specifies that the heredoc should be parsed as a nowdoc, which is a special form of heredoc in which the contents do not get interpolated by bash, but rather passed on in literal format
Any content that is encountered between <<'EOT' and <newline>EOT<newline> will be appended to the nowdoc output
EOT terminates the nowdoc, resulting in a nowdoc temporary file being created and passed back to the calling cat command. cat outputs the nowdoc and passes the output back to the capturing interpolated string
) concludes the command to be executed
" concludes the capturing interpolated string. The contents of the interpolated string will be passed back to ssh as a single command line argument, which ssh will interpret as the remote command to execute as user#server
If you need to avoid using external tools like cat, and don't mind having two statements instead of one, use the read built-in with a heredoc to generate the SSH command:
IFS='' read -r -d '' SSH_COMMAND <<'EOT'
echo "These commands will be run on: $( uname -a )"
echo "They are executed by: $( whoami )"
EOT
ssh user#server "${SSH_COMMAND}"
I'm adding this answer because it solved a related problem that I was having with the same error message.
Problem: I had installed cygwin under Windows and was getting this error: Pseudo-terminal will not be allocated because stdin is not a terminal
Resolution: It turns out that I had not installed the openssh client program and utilities. Because of that cygwin was using the Windows implementation of ssh, not the cygwin version. The solution was to install the openssh cygwin package.
All relevant information is in the existing answers, but let me attempt a pragmatic summary:
tl;dr:
DO pass the commands to run using a command-line argument:
ssh jdoe#server '...'
'...' strings can span multiple lines, so you can keep your code readable even without the use of a here-document:
ssh jdoe#server ' ... '
Do NOT pass the commands via stdin, as is the case when you use a here-document:
ssh jdoe#server <<'EOF' # Do NOT do this ... EOF
Passing the commands as an argument works as-is, and:
the problem with the pseudo-terminal will not even arise.
you won't need an exit statement at the end of your commands, because the session will automatically exit after the commands have been processed.
In short: passing commands via stdin is a mechanism that is at odds with ssh's design and causes problems that must then be worked around.
Read on, if you want to know more.
Optional background information:
ssh's mechanism for accepting commands to execute on the target server is a command-line argument: the final operand (non-option argument) accepts a string containing one or more shell commands.
By default, these commands run unattended, in a non-interactive shell, without the use of a (pseudo) terminal (option -T is implied), and the session automatically ends when the last command finishes processing.
In the event that your commands require user interaction, such as responding to an interactive prompt, you can explicitly request the creation of a pty (pseudo-tty), a pseudo terminal, that enables interacting with the remote session, using the -t option; e.g.:
ssh -t jdoe#server 'read -p "Enter something: "; echo "Entered: [$REPLY]"'
Note that the interactive read prompt only works correctly with a pty, so the -t option is needed.
Using a pty has a notable side effect: stdout and stderr are combined and both reported via stdout; in other words: you lose the distinction between regular and error output; e.g.:
ssh jdoe#server 'echo out; echo err >&2' # OK - stdout and stderr separate
ssh -t jdoe#server 'echo out; echo err >&2' # !! stdout + stderr -> stdout
In the absence of this argument, ssh creates an interactive shell - including when you send commands via stdin, which is where the trouble begins:
For an interactive shell, ssh normally allocates a pty (pseudo-terminal) by default, except if its stdin is not connected to a (real) terminal.
Sending commands via stdin means that ssh's stdin is no longer connected to a terminal, so no pty is created, and ssh warns you accordingly:
Pseudo-terminal will not be allocated because stdin is not a terminal.
Even the -t option, whose express purpose is to request creation of a pty, is not enough in this case: you'll get the same warning.
Somewhat curiously, you must then double the -t option to force creation of a pty: ssh -t -t ... or ssh -tt ... shows that you really, really mean it.
Perhaps the rationale for requiring this very deliberate step is that things may not work as expected. For instance, on macOS 10.12, the apparent equivalent of the above command, providing the commands via stdin and using -tt, does not work properly; the session gets stuck after responding to the read prompt:
ssh -tt jdoe#server <<<'read -p "Enter something: "; echo "Entered: [$REPLY]"'
In the unlikely event that the commands you want to pass as an argument make the command line too long for your system (if its length approaches getconf ARG_MAX - see this article), consider copying the code to the remote system in the form of a script first (using, e.g., scp), and then send a command to execute that script.
In a pinch, use -T, and provide the commands via stdin, with a trailing exit command, but note that if you also need interactive features, using -tt in lieu of -T may not work.
The warning message Pseudo-terminal will not be allocated because stdin is not a terminal. is due to the fact that no command is specified for ssh while stdin is redirected from a here document.
Due to the lack of a specified command as an argument ssh first expects an interactive login session (which would require the allocation of a pty on the remote host) but then has to realize that its local stdin is no tty/pty. Redirecting ssh's stdin from a here document normally requires a command (such as /bin/sh) to be specified as an argument to ssh - and in such a case no pty will be allocated on the remote host by default.
Since there are no commands to be executed via ssh that require the presence of a tty/pty (such as vim or top) the -t switch to ssh is superfluous.
Just use ssh -T user#server <<EOT ... or ssh user#server /bin/bash <<EOT ... and the warning will go away.
If <<EOF is not escaped or single-quoted (i. e. <<\EOT or <<'EOT') variables inside the here document will be expanded by the local shell before it is executing ssh .... The effect is that the variables inside the here document will remain empty because they are defined only in the remote shell.
So, if $REL_DIR should be both accessible by the local shell and defined in the remote shell, $REL_DIR has to be defined outside the here document before the ssh command (version 1 below); or, if <<\EOT or <<'EOT' is used, the output of the ssh command can be assigned to REL_DIR if the only output of the ssh command to stdout is genererated by echo "$REL_DIR" inside the escaped/single-quoted here document (version 2 below).
A third option would be to store the here document in a variable and then pass this variable as a command argument to ssh -t user#server "$heredoc" (version 3 below).
And, last but not least, it would be no bad idea to check if the directories on the remote host were created successfully (see: check if file exists on remote host with ssh).
# version 1
unset DEP_ROOT REL_DIR
DEP_ROOT='/tmp'
datestamp=$(date +%Y%m%d%H%M%S)
REL_DIR="${DEP_ROOT}/${datestamp}"
ssh localhost /bin/bash <<EOF
if [ ! -d "$DEP_ROOT" ] && [ ! -e "$DEP_ROOT" ]; then
echo "creating the root directory" 1>&2
mkdir "$DEP_ROOT"
fi
mkdir "$REL_DIR"
#echo "$REL_DIR"
exit
EOF
scp -r ./dir1 user#server:"$REL_DIR"
scp -r ./dir2 user#server:"$REL_DIR"
# version 2
REL_DIR="$(
ssh localhost /bin/bash <<\EOF
DEP_ROOT='/tmp'
datestamp=$(date +%Y%m%d%H%M%S)
REL_DIR="${DEP_ROOT}/${datestamp}"
if [ ! -d "$DEP_ROOT" ] && [ ! -e "$DEP_ROOT" ]; then
echo "creating the root directory" 1>&2
mkdir "$DEP_ROOT"
fi
mkdir "$REL_DIR"
echo "$REL_DIR"
exit
EOF
)"
scp -r ./dir1 user#server:"$REL_DIR"
scp -r ./dir2 user#server:"$REL_DIR"
# version 3
heredoc="$(cat <<'EOF'
# -onlcr: prevent the terminal from converting bare line feeds to carriage return/line feed pairs
stty -echo -onlcr
DEP_ROOT='/tmp'
datestamp="$(date +%Y%m%d%H%M%S)"
REL_DIR="${DEP_ROOT}/${datestamp}"
if [ ! -d "$DEP_ROOT" ] && [ ! -e "$DEP_ROOT" ]; then
echo "creating the root directory" 1>&2
mkdir "$DEP_ROOT"
fi
mkdir "$REL_DIR"
echo "$REL_DIR"
stty echo onlcr
exit
EOF
)"
REL_DIR="$(ssh -t localhost "$heredoc")"
scp -r ./dir1 user#server:"$REL_DIR"
scp -r ./dir2 user#server:"$REL_DIR"
I don't know where the hang comes from, but redirecting (or piping) commands into an interactive ssh is in general a recipe for problems. It is more robust to use the command-to-run-as-a-last-argument style and pass the script on the ssh command line:
ssh user#server 'DEP_ROOT="/home/matthewr/releases"
datestamp=$(date +%Y%m%d%H%M%S)
REL_DIR=$DEP_ROOT"/"$datestamp
if [ ! -d "$DEP_ROOT" ]; then
echo "creating the root directory"
mkdir $DEP_ROOT
fi
mkdir $REL_DIR'
(All in one giant '-delimited multiline command-line argument).
The pseudo-terminal message is because of your -t which asks ssh to try to make the environment it runs on the remote machine look like an actual terminal to the programs that run there. Your ssh client is refusing to do that because its own standard input is not a terminal, so it has no way to pass the special terminal APIs onwards from the remote machine to your actual terminal at the local end.
What were you trying to achieve with -t anyway?
After reading a lot of these answers I thought I would share my resulting solution. All I added is /bin/bash before the heredoc and it doesn't give the error anymore.
Use this:
ssh user#machine /bin/bash <<'ENDSSH'
hostname
ENDSSH
Instead of this (gives error):
ssh user#machine <<'ENDSSH'
hostname
ENDSSH
Or use this:
ssh user#machine /bin/bash < run-command.sh
Instead of this (gives error):
ssh user#machine < run-command.sh
EXTRA:
If you still want a remote interactive prompt e.g. if the script you're running remotely prompts you for a password or other information, because the previous solutions won't allow you to type into the prompts.
ssh -t user#machine "$(<run-command.sh)"
And if you also want to log the entire session in a file logfile.log:
ssh -t user#machine "$(<run-command.sh)" | tee -a logfile.log
I was having the same error under Windows using emacs 24.5.1 to connect to some company servers through /ssh:user#host. What solved my problem was setting the "tramp-default-method" variable to "plink" and whenever I connect to a server I ommit the ssh protocol. You need to have PuTTY's plink.exe installed for this to work.
Solution
M-x customize-variable (and then hit Enter)
tramp-default-method (and then hit Enter again)
On the text field put plink and then Apply and Save the buffer
Whenever I try to access a remote server I now use C-x-f /user#host: and then input the password. The connection is now correctly made under Emacs on Windows to my remote server.