I am not that good on linux shell script and I need little help.
I want to edit a file via script (finding the line and edit).
The Original line is:
# JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=< hostname >"
I want to uncomment and replaye hostname with 127.0.0.1
JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=127.0.0.1"
You can refer to the set command, change the filename with the name you are working at,
sed -i 's## JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=< hostname >"#JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=127.0.0.1"#' filename
Fine answers, but they don't do anything by way of TEACHING the gentleman how and why it works.
If you were using the mundane text editor, ed, you would use three commands after invoking the command "ed filename":
s/^# //
s/< hostname>/127.0.0.1/
w
So, you can use a pipe to submit those commands directly to ed, specifying "-" as its first argument so that it doesn't bother you by reporting character counts upon reading in and writing out the file:
( echo 's/^# //'; echo 's//127.0.0.1/'; echo w ) | ed - filename
You don't need to echo 'q' also because ed will automatically quit when it runs out of input or encounters "end of file" (you can simulate this on the keyboard by just hitting the CTRL-D key rather than actually typing q ).
Here's one way to do it:
sed -i -e 's/# \(JVM_OPTS=.*=\).*/\1127.0.0.1"/' path/to/file
That is, replace the line with the text captured within the group \(JVM_OPTS=.*=\), so everything from JVM_OPTS= until another = sign, and append 127.0.0.1" to the end.
If there might be other lines in the file starting with # JVM_OPTS=,
then you could make the pattern matching more strict, for example:
sed -i -e 's/# \(JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=\).*/\1127.0.0.1"/' path/to/file
Related
Sorry if I am not giving you enough info, this is my first time posting here.
I am trying to make this in a bash script.
Downloading...............
"run bash commands and when they are done, replace the "Downloading..." text with the text bellow in the same line aka space."
Downloading............... DONE!
go to next line and show
Installing................
"run bash commands again and when they are done, replace the "Installing..." text with the text bellow in the same line aka space."
Installing................ DONE!
I hope you get what I mean. Thanks in advance.
I've tried:
#/bin/bash
tput sc # save cursor
printf "Something that I made up for this string"
sleep 1
tput rc;tput el # rc = restore cursor, el = erase to end of line
printf "Another message for testing"
sleep 1
tput rc;tput el
printf "Yet another one"
sleep 1
tput rc;tput el
But it doesn't make new lines, it just uses one line to show all text.
I'm assuming you pulled the tput code from somewhere, and I'm guessing that 'somewhere' also explained that tput is being used to overwrite the same line multiple times (as your script actually does).
From your description it doesn't sound like you need to overwrite any lines so using tput is the wrong solution.
If I understand your description correctly you should be able to do everything you want with some (relatively) simple printf commands, eg:
printf "Downloading .... " # no '\n' in the output so cursor remains at end of current line
# run your bash commands here
printf "DONE!\n" # append to end of current line and then add a new line (\n)
printf "Installing .... " # no '\n' in the output so cursor remains at end of current line
# run more bash commands here
printf "DONE!\n" # append to end of the current line and then add a new line (\n)
Keep in mind that if any of your 'bash commands' generate any output then the cursor will be moved (probably to a new line) thus messing up your output. Net result is that you'll need to make sure your 'bash commands' do not generate any output to stdout/stderr (alternatively, make sure all output - stdout/stderr - is redirected to files).
If your requirement is to have the 'bash commands' send output to the terminal then you may need to go back to using tput ... but that's going to depend on exactly how you want the output to appear.
NOTE: If this (above) does not meet your requirement then please update the question with more details.
want to search and replace in vim, the /find finds the pattern but :s%//g will not?
have a script that monitors software raid (if interested check it out https://dwaves.org/2019/09/06/linux-server-monitor-software-raid-mail-notification-on-failure/)
echo "=== smart status of all drives ==="| tee -a /scripts/monitor/raid_status_mail.log
# want to search and replace the /path/to/file.sh with $LOGFILE
# searching for the pattern works like charm
/\/scripts\/monitor\/raid_status_mail.log
# but replacing it won't
:s%/\/scripts\/monitor\/raid_status_mail\.log/\$LOGFILE/g
# what does one do wrong?
should replace /scripts/monitor/raid_status_mail.log with $LOGFILE
The substitution operation needs to be prefixed with %s and not the other way around as s%. So doing
%s/\/scripts\/monitor\/raid_status_mail\.log/\$LOGFILE/g
should work as expected. Or just the Vim's equivalent ex in command line mode as
printf '%s\n' "%s/\/scripts\/monitor\/raid_status_mail\.log/\$LOGFILE/g" w q | ex -s file
You inverted the beginning s%. Use %s instead.
Also, you use / as separation for the different fields, it works but makes the command less readable. You can replace the separation character by anything else. You could use : for example:
%s:/scripts/monitor/raid_status_mail.log:$LOGFILE:g
One last tip: install vim-over
This will highlight your searches in live while replacing something in vim.
I would like to do a sed command in Linux to uncomment the "#auth"
Original file
#%PAM-1.0
auth sufficient pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth sufficient pam_wheel.so trust use_uid
I can write this command to do it:
sed 's/#auth.*sufficient.*pam_wheel.so trust use_uid/auth\t sufficient\t pam_wheel.so trust use_uid/' /etc/pam.d/su
But I think it is too long. Is there any better way to do this (more generic)?
I don't want to specific the line number to replace it, because if someone changed the file, the script will not run normally.
For example:
Search keyword "#auth.*sufficient.*pam_wheel.so trust use_uid", if found, replace this the word "#auth" to "auth", and then append the later wording in the line
With GNU sed, look up the -i option that allows in-place modification and then anchor the regular expression. For instance:
sed -i '/^#auth.*pam_wheel/s/^#//' INPUTFILE
will look for lines beginning with "#auth" that include "pam_wheel" later on the line and replace the "#" at the beginning with nothing.
In bash, how do I search for the following string in a file ~/.netrc and delete that line plus the next two lines if found:
machine api.mydomain.com
Example is:
machine api.mydomain.com
user foo
password bar
It should delete all three lines, but I can't match user and password since those are unknown. The only fixed value is machine api.mydomain.com.
Try:
sed -i '' '/^machine api.mydomain.com$/{N;N;d;}' ~/.netrc
When this finds the line machine api.mydomain.com, it reads in two more lines and then deletes them all. Other lines pass through unchanged.
For GNU sed, the argument to -i is optional. For OSX (BSD) sed, the argument is required but is allowed to be empty as shown above.
Let's google it together - sed or awk: delete n lines following a pattern
So, the answer is sed -e '/machine api.mydomain.com/,+2d' ~/.netrc. Add -i flag if changes need to be done in place.
I have received a csv file from a ftp server which I am ingesting into a table.
While ingesting the file I am receiving the error "File was a truncated file"
The actual reason is the data in a file contains $ and ^M$ in end of the line.
e.g :
ACT_RUN_TM, PROG_RUN_TM, US_HE_DT*^M$*
"CONFIRMED","","3600"$
How can I remove these $ and ^M$ from end of the line using linux command.
The ultimately correct solution is to transfer the file from the FTP server in text mode rather than binary mode, which does the appropriate end-of-line conversion for you. Change your download scripts or FTP application configuration to enable text transfers to fix this in future.
Assuming this is a one-shot transfer and you have already downloaded the file and just want to fix it, you can use tr(1) to translate characters. So to remove all control-M characters from a file, you can pipe through tr -d '\r'. Or if you want to replace them with control-J instead – for example you would do this if the file came from a pre-OSX Mac system — do tr '\r' '\n'.
It's odd to see ^M as not-the-last character, but:
sed -e 's/^M*\$$//g' <badfile >goodfile
Or use "sed -i" to update in-place.
(Note that "^M" is entered on the command line by pressing CTRL-V CTRL_M).
Update: It's been established that the question is wrong as the "^M$" are not in the file but displayed with VI. He actually wants to change CRLF pairs to just LF.
sed -e 's/^M$//g' <badfile >goodfile