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[[Anchor(faq66)]] <<Anchor(faq66)>>
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The portable solution uses `case`:
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Here's a portable solution:
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   case $var in    # Bourne
case "$var" in
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And here's one that uses '[[': In Bash and ksh, [[glob|Extended globs]] can also do this within a `[[` command:
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   if [[ $var =~ foo|bar|more ]]; then    # bash/ksh -- ksh does not need the shopt
   shopt -s extglob
if [[ $var = @(foo|bar|more) ]]; then
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Alternatively, the "inarray" function could be used:
{{{
   # usage: inarray NEEDLE HAYSTACK ...
   # returns 0 if NEEDLE is in HAYSTACK, otherwise 1.
   inarray() {
     local n=$1 h
     shift

     for n; do
       [[ $n = "$h" ]] && return
     done
     return 1
   }

   if inarray $var foo bar more; then
     ...
   fi
}}}

----
CategoryShell

I want to check if [[ $var == foo || $var == bar || $var == more ]] without repeating $var n times.

The portable solution uses case:

   # Bourne
   case "$var" in
      foo|bar|more) ... ;;
   esac

In Bash and ksh, Extended globs can also do this within a [[ command:

   # bash/ksh -- ksh does not need the shopt
   shopt -s extglob
   if [[ $var = @(foo|bar|more) ]]; then
      ...
   fi

Alternatively, the "inarray" function could be used:

   # usage: inarray NEEDLE HAYSTACK ...
   # returns 0 if NEEDLE is in HAYSTACK, otherwise 1.
   inarray() {
     local n=$1 h
     shift

     for n; do
       [[ $n = "$h" ]] && return
     done
     return 1
   }

   if inarray $var foo bar more; then
     ...
   fi


CategoryShell

BashFAQ/066 (last edited 2022-11-23 19:29:49 by GreyCat)