ahk

USEFUL CONSTRUCTS IN KSH

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### turn $path into just the NAME of the file
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${path##*/}

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### turn $file into just the DIRECTORY of the file
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${path%${path##*/}}

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###  turn $path into a FULL PATH
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if [[ x${path#/} = x$path ]] ; then path=$PWD/$path ; fi

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###  /$file  or nothing if $file is undefined
###   $file/ or nothing if $file is undefined
###  /$file/ or nothing if $file is undefined
###
${file:+/}${file}
          ${file}${file:+/}
${file:+/}${file}${file:+/}

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