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POQuoting command-line arguments in shell scripts
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  1. POQuoting command-line arguments in shell scripts
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    copied!<p>The following shell script takes a list of arguments, turns Unix paths into WINE/Windows paths and invokes the given executable under WINE.</p> <pre><code>#! /bin/sh if [ "${1+set}" != "set" ] then echo "Usage; winewrap EXEC [ARGS...]" exit 1 fi EXEC="$1" shift ARGS="" for p in "$@"; do if [ -e "$p" ] then p=$(winepath -w $p) fi ARGS="$ARGS '$p'" done CMD="wine '$EXEC' $ARGS" echo $CMD $CMD </code></pre> <p>However, there's something wrong with the quotation of command-line arguments.</p> <pre><code>$ winewrap '/home/chris/.wine/drive_c/Program Files/Microsoft Research/Z3-1.3.6/bin/z3.exe' -smt /tmp/smtlib3cee8b.smt Executing: wine '/home/chris/.wine/drive_c/Program Files/Microsoft Research/Z3-1.3.6/bin/z3.exe' '-smt' 'Z: mp\smtlib3cee8b.smt' wine: cannot find ''/home/chris/.wine/drive_c/Program' </code></pre> <p>Note that:</p> <ol> <li>The path to the executable is being chopped off at the first space, even though it is single-quoted.</li> <li>The literal "\t" in the last path is being transformed into a tab character.</li> </ol> <p>Obviously, the quotations aren't being parsed the way I intended by the shell. How can I avoid these errors?</p> <p>EDIT: The "\t" is being expanded through two levels of indirection: first, <code>"$p"</code> (and/or <code>"$ARGS"</code>) is being expanded into <code>Z:\tmp\smtlib3cee8b.smt</code>; then, <code>\t</code> is being expanded into the tab character. This is (seemingly) equivalent to</p> <pre><code>Y='y\ty' Z="z${Y}z" echo $Z </code></pre> <p>which yields </p> <pre><code>zy\tyz </code></pre> <p>and <em>not</em></p> <pre><code>zy yz </code></pre> <p>UPDATE: <code>eval "$CMD"</code> does the trick. The "<code>\t</code>" problem seems to be echo's fault: "If the first operand is -n, or if any of the operands contain a backslash ( '\' ) character, the results are implementation-defined." (<a href="http://www.opengroup.org/onlinepubs/009695399/utilities/echo.html" rel="nofollow noreferrer">POSIX specification of <code>echo</code></a>)</p>
 

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