What I'm trying to accomplish is having a central configuration file, in bash, that defines some variables that are re-used in different bash files. The example below attempts to generate a file name with the current date included in the file name as well as a variable defined in another shell script. However whenever I try to concatenate this external variable it doesn't work. I can concatenate the variable in any other situation.
Example Code:
../config/vars.sh
#!/bin/bash
mysqlUser="backupuser"
mysqlPwd="fakePwd"
mysqlSocket="/var/run/mysqld/mysqld.sock"
mysqlPort="3306"
serverName="s01.catchyservername.com"
./dbBackup.sh
#!/bin/bash
source ../config/vars.sh
tempName=$(date +"%Y%m%d.sql.gz")
fileName="mysqld_${mysqlPort}_${tempName}"
echo "mysqld_${mysqlPort}"
echo ${tempName}
echo ${fileName}
output of dbBackup.sh
mysqld_3306
20140926.sql.gz
_20140926.sql.gz
As you can see when echoing "mysqld_${mysqlPort}" I get the expected output, but when echoing ${fileName} the entire first half of the string is ignored. What am I misunderstanding?
Your vars.sh file was probably created with a DOS/windows text editor:
$ ./dbBackup.sh
mysqld_3306
20140926.sql.gz
_20140926.sql.gz
$ dos2unix vars.sh
dos2unix: converting file vars.sh to Unix format ...
$
$ ./dbBackup.sh
mysqld_3306
20140926.sql.gz
mysqld_3306_20140926.sql.gz
$
As you can see above, I use the dos2unix utility to convert the line separators to Unix style.
Related
Can someone fix this for me.
It should copy a version log file to backup after moving to a repo directory
Then it automatically appends line given as input to the log file with some formatting.
That's it.
Assume existence of log file and test directory.
#!/bin/bash
cd ~/Git/test
cp versionlog.MD .versionlog.MD.old
LOGDATE="$(date --utc +%m-%d-%Y)"
read -p "MSG > " VHMSG |
VHENTRY="- **${LOGDATE}** | ${VHMSG}"
cat ${VHENTRY} >> versionlog.MD
shell output
virufac#box:~/Git/test$ ~/.logvh.sh
MSG > testing script
EOF
EOL]
EOL
e
E
CTRL + C to get out of stuck in reading lines of input
virufac#box:~/Git/test$ cat versionlog.MD
directly outputs the markdown
# Version Log
## version 0.0.1 established 01-22-2020
*Working Towards Working Mission 1 Demo in 0.1 *
- **01-22-2020** | discovered faker.Faker and deprecated old namelessgen
EOF
EOL]
EOL
e
E
I finally got it to save the damned input lines to the file instead of just echoing the command I wanted to enter on the screen and not executing it. But... why isn't it adding the lines built from the VHENTRY variable... and why doesn't it stop reading after one line sometimes and this time not. You could see I was trying to do something to tell it to stop reading the input.
After some realizing a thing I had done in the script was by accident... I tried to fix it and saw that the | at the end of the read command was seemingly the only reason the script did any of what it did save to the file in the first place.
I would have done this in python3 if I had know this script wouldn't be the simplest thing I had ever done. Now I just have to know how you do it after all the time spent on it so that I can remember never to think a shell script will save time again.
Use printf to write a string to a file. cat tries to read from a file named in the argument list. And when the argument is - it means to read from standard input until EOF. So your script is hanging because it's waiting for you to type all the input.
Don't put quotes around the path when it starts with ~, as the quotes make it a literal instead of expanding to the home directory.
Get rid of | at the end of the read line. read doesn't write anything to stdout, so there's nothing to pipe to the following command.
There isn't really any need for the VHENTRY variable, you can do that formatting in the printf argument.
#!/bin/bash
cd ~/Git/test
cp versionlog.MD .versionlog.MD.old
LOGDATE="$(date --utc +%m-%d-%Y)"
read -p "MSG > " VHMSG
printf -- '- **%s** | %s\n' "${LOGDATE}" "$VHMSG" >> versionlog.MD
I am trying to create a shell script for logs and trying to append data into a text file. I have write this sample "test.sh" code for testing:
#!/bin/sh -e
touch /home/sample.txt
SPTH = '/home/sample'.txt
echo "MY LOG FILE" >> "$SPTH"
echo "DUMP started at $(date +'%d-%m-%Y %H:%M:%S')" >> /home/sample.txt
echo "DUMP finished at $(date +'%d-%m-%Y %H:%M:%S')" >> /home/sample.txt
but in above code all lines are working correct except one line of code i.e.
echo "MY LOG FILE" >> "$SPTH"
It is giving error:
test.sh: line 6: : No such file or directory
I want to replace this full path of file "/home/sample.txt" to variable "$SPATH".
I am executing my shell script using
sh test.sh
What I am doing wrong.
Variable assignments in bash shell does not allow you to have spaces within. It will be actually interpreted as command with = and the subsequent keywords as arguments to the first word, which is wrong.
Change your code to
SPTH="/home/sample.txt"
That is the reason why SPTH was not assigned to the actual path you intended it to have. And you have no reason to have single-quote here and excluding the extension part. Using it fully within double-quotes is absolutely fine.
The syntax for the command line is that the first token is a command, tokens are separated by whitespace. So:
SPTH = '/home/sample'.txt
Has the command as SPTH, the second token is =, and so on. You might think this is daft, but most shells behave like this for historical reasons.
So you need to remove the whitespace:
SPTH='/home/sample'.txt
I am trying to create a zsh script to test my project. The teacher supplied us with some input files and expected output files. I need to diff the output files from myExecutable with the expected output files.
Question: Does $iF contain a string in the following code or some kind of bash reference to the file?
#!/bin/bash
inputFiles=~/project/tests/input/*
outputFiles=~/project/tests/output
for iF in $inputFiles
do
./myExecutable $iF > $outputFiles/$iF.out
done
Note:
Any tips in fulfilling my objectives would be nice. I am new to shell scripting and I am using the following websites to quickly write the script (since I have to focus on the project development and not wasting time on extra stuff):
Grammar for bash language
Begginer guide for bash
As your code is, $iF contains full path of file as a string.
N.B: Don't use for iF in $inputFiles
use for iF in ~/project/tests/input/* instead. Otherwise your code will fail if path contains spaces or newlines.
If you need to diff the files you can do another for loop on your output files. Grab just the file name with the basename command and then put that all together in a diff and output to a ".diff" file using the ">" operator to redirect standard out.
Then diff each one with the expected file, something like:
expectedOutput=~/<some path here>
diffFiles=~/<some path>
for oF in ~/project/tests/output/* ; do
file=`basename ${oF}`
diff $oF "${expectedOutput}/${file}" > "${diffFiles}/${file}.diff"
done
I have a file which has environment variable listed like
VAR_NAME=abc
and this file is sourced when needed. I want to add a new environment variable to the file if it's not present already. How do I search this file and replace/add a new value to it?
I was doing this till now:
echo "string_created" >> fileName
this just appends a line and after few runs there were multiple lines with diff values. I can remove this file after one run of my program but that isn't definitive.
You can use grep:
grep -q '^VAR_NAME=' file || echo 'VAR_NAME=abc' >> file
echo will execute when grep returns non-success return code.
I am writing a shell script which reads data from a properties file and stores in into a local variable in shell script. The problem is when i am trying to read multiple properties from the file and form a string its getting over written
#!/bin/bash
. /opt/oracle/scripts/user.properties
echo $username
echo $password
echo $service_name
conn=$username$password$service_name
echo $conn
the values of username=xxxx password=yyyy and service_name=zzzz i expect the output to be
xxxxyyyyzzzz
but instead of that i am getting the output as
zzzz
please tell me where am i doing the mistake ?
I'm certain that the file /opt/oracle/scripts/user.properties contains CR+LF line endings. (Running the file command for the properties file would say ... with CRLF line terminators). Changing those to LF using dos2unix or any other utility should make it work.
Moreover, instead of saying:
conn=$username$password$service_name
you could say:
conn="${username}${password}${service_name}"