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#!/bin/sh
IFS=$' \t\n'#!/bin/sh
# Note: \n can not be last, or it will be stripped by $()
IFS=$(printf ' \n\t')or
#!/bin/sh
# Trailing linefeed added literally
IFS="$(printf ' \t')
"or
#!/bin/bash
# Bash supports this
IFS=$' \t\n'ANSI-C quoting, $'..', is a bash extension, which is not supported by POSIX sh.
To ensure the script runs correctly on other systems, either switch to Bash, or rewrite it in a POSIX compatible way.
This can generally done via printf as in the example. Be careful about strings with trailing linefeeds, as a $(command substitution) will strip them.
None.
POSIX.1-2024 introduced Dollar-Single-Quotes. This rule was last applicable to POSIX.1-2017.
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