Check if a File or Directory Exists in Bash
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In Bash, you can use the test command to check whether a file exists and determine the type of the file.
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If you want your script to be portable you should prefer using the old test `[` command which is available on all POSIX shells. The new upgraded version of the test command `[[` (double brackets) is supported on most modern systems using Bash, Zsh, and Ksh as a default shell.
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