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How to check if bash variable defined in script

Posted: 29 Jan 2021 03:30 AM PST

I need to set a bash environment variable called PURGEIMAGE and take specific actions in my script. For example, if PURGEIMAGE set, then purge images from CDN else just URL. I am going to call my script as PURGEIMAGE=yes ./purgecache.sh url1 url2. So how do I know if a bash variable set at the CLI and used in my bash script running on Linux or Unix-like systems?

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Bash Shell: Replace a String With Another String In All Files Using sed and Perl -pie Options

Posted: 28 Jan 2021 11:20 PM PST

{Updated} How do I replace a string with another string in all files using sed, Bash or Perl?

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