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Tag: shell

Exit whole script from code block { }

I have the following script: But the problem is that the {} block is exiting and not the whole script. How can I make the whole script exit? Answer Add the following line after your tee command: test ${PIPESTATUS[0]} -eq 0 || exit ${PIPESTATUS[0]} Reference Link: https://stackoverflow.com/a/34386000/2357256

How do I classify files in Linux server by their names?

How can use the ls command and options to list the repetitious filenames that are in different directories? Answer You can’t use a single, basic ls command to do this. You’d have to use a combination of other POSIX/Unix/GNU utilities. For example, to find the duplicate filenames first: This means find all the files (-type f) through the entire directory

Pass Telnet Command to SSH in Bash Script

I’m trying to write a bash to first ssh into a server and then telnet from that server to a ElastiCache Redis endpoint. My Code is the following: telnet.sh I would like to call my bash script and have the user interactively be connected to the Redis Cluster so that the user can enter redis cli commands after invoking telnet.sh.

Bash: if statement always succeeding

I have the following if statement to check if a service, newrelic-daemon in this case, is running… The problem is it’s always returning as true, i.e. “New Relic is already running”. Even though when I run the if condition separately… … it returns 0. I expect it to do nothing here as the value returned is =0 but my IF

How to specify two variables on bash command line?

For example, I can do this: But how can I do this? I cannot use this: I have to do it in one line Answer As far as I know, every Bourne shell allows any number of name=value pairs preceding the command to establish the environment. Bash certainly does.

Using variables on grep –q doesn’t produce founds

I need to extract entries from a log file and put them on an errors file. I don’t want to duplicate the entries on the errors file every time that the script is run, so I create this: And is run using: The first time that the script runs it finds the entries, and create the errors file (there are

Bash sort -nu results in unexpected behaviour

A colleague of mine noticed some odd behaviour with the sort command today, and I was wondering if anyone knows if the output of this command is intentional or not? Given the file: We are looking to sort the file with numeric sort, and also make it unique, so we run: The output is: Now, we know that the numeric

Function to search of multiple patterns using grep

I want to make a bash script to use grep to search for lines which have multiple patterns (case-insensitive). I want to create a bash script which I can use as follows: and it should get traslated to: I tried following bash script, but it is not working: The error is: Answer I think you can do a recursive function:

Variable as Tar file name in SunOs 5.10

I am trying to get the following result in the 1.files archived as tar with current date as a part of the tar name. 2.files removed once archived. /usr/sap/ST1/POC/backtest/*.txt has 2 txt files. This works fine as the file name is mentioned as arc_2017-02-28.tar. But when I tried this: The output is an error: tar: : No such file or

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