Date: Sun, 20 Feb 2011 19:37:36 -0700 (MST) From: Warren Block <wblock@wonkity.com> To: questions@freebsd.org Subject: Re: Backtick versus $() Message-ID: <alpine.BSF.2.00.1102201905410.58349@wonkity.com> In-Reply-To: <alpine.BSF.2.00.1102201027170.56885@wonkity.com> References: <alpine.BSF.2.00.1102201027170.56885@wonkity.com>
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Dropped the last line of the script. Also lined up the seds to show the
regex is the same in both.
#!/bin/sh
DESTDIR="./"
COMPFILE=".cshrc"
PSTR=`echo "${DESTDIR}${COMPFILE}" | sed 's%\([?:.%\\]\)%\\\1%g'`
echo ${PSTR}
PSTR=$(echo "${DESTDIR}${COMPFILE}" | sed 's%\([?:.%\\]\)%\\\1%g')
echo ${PSTR}
Also, the difference is in escapes; two more backslashes added to the
backtick version make it work:
PSTR=`echo "${DESTDIR}${COMPFILE}" | sed 's#\([?:.%\\]\)#\\\\\1#g'`
echo ${PSTR}
Still: aren't backticks and $() supposed to be equivalent?
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