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Create bash-gotchas.md

David Stark committed 2020-06-02 01:09:48 +0100 commit a288e09c9e2fabe7a0e1defdcef699cf6a4719c2

				compute/bash-gotchas.md
			
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          +# Bash Gotchas

          +This kind of shit is why sysadmins drink.

          +

          +### (( )) can return false 

          +(Iff)[https://en.wikipedia.org/wiki/If_and_only_if] the expression in (( )) evaluates to 0, the (( )) returns false, so your 'set -e' script will fall on its arse.

          +

          +### pipes into read can return false

          +In some old versions of bash (e.g. RHEL6), piping commands into `while read -r blah` will fail at the end of the stream.

          +Use `while read -r blah; do something; done < <(command>)` instead.

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	1	+# Bash Gotchas
	2	+This kind of shit is why sysadmins drink.
	3	+
	4	+### (( )) can return false
	5	+(Iff)[https://en.wikipedia.org/wiki/If_and_only_if] the expression in (( )) evaluates to 0, the (( )) returns false, so your 'set -e' script will fall on its arse.
	6	+
	7	+### pipes into read can return false
	8	+In some old versions of bash (e.g. RHEL6), piping commands into `while read -r blah` will fail at the end of the stream.
	9	+Use `while read -r blah; do something; done < <(command>)` instead.