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README.md
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README.md
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@ -99,6 +99,7 @@ scripts and not full blown utilities.
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* [Get the current working directory.](#get-the-current-working-directory)
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* [Get the number of seconds the script has been running.](#get-the-number-of-seconds-the-script-has-been-running)
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* [Other](#other)
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* [Check if a program is in the user's PATH.](#check-if-a-program-is-in-the-users-path)
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* [Get the current date using `strftime`.](#get-the-current-date-using-strftime)
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* [Bypass shell aliases.](#bypass-shell-aliases)
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* [Bypass shell functions.](#bypass-shell-functions)
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@ -1113,6 +1114,29 @@ This is an alternative to the `pwd` built-in.
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# Other
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## Check if a program is in the user's PATH.
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```shell
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# Bare.
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type -p executable_name &>/dev/null
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# As a test.
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if type -p executable_name &>/dev/null; then
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# Program is in PATH.
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fi
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# Inverse.
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if ! type -p executable_name &>/dev/null; then
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# Program is not in PATH.
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fi
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# Example (Exit early if program isn't installed).
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if ! type -p convert &>/dev/null; then
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printf '%s\n' "error: convert isn't installed, exiting..."
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exit 1
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fi
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```
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## Get the current date using `strftime`.
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Bash’s `printf` has a built-in method of getting the date which we can use
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