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|
#! /bin/sh
# Zcat - Cat wrapper for compressed files.
# Copyright (C) 2009 Antonio Diaz Diaz.
#
# This script is free software: you have unlimited permission
# to copy, distribute and modify it.
LC_ALL=C
export LC_ALL
args=
gz_args=
xz_args=
recursive=0
two_hyphens=0
# Loop over args until a filename is found
while [ -n "$1" ] ; do
case "$1" in
--help | --he* | -h)
echo "Zcat - Cat wrapper for compressed files."
echo
echo "Zcat is a wrapper script around the cat command that allows transparent"
echo "concatenation of any combination of compressed and non-compressed files."
echo "If any given file is compressed, its uncompressed content is used. If a"
echo "given file does not exist, zcat tries the compressed file names"
echo "corresponding to the supported compressors. If no files are specified,"
echo "data is read from standard input, decompressed if needed, and sent to"
echo "stdout. Data read from standard input must be of the same type; all"
echo "uncompressed or all compressed with the same compressor."
echo "The supported compressors are bzip2, gzip, lzip and xz."
echo
echo "Usage: $0 [OPTIONS] [CAT_OPTIONS] [FILES]"
echo
echo "CAT_OPTIONS are passed directly to cat."
echo "The exit status from cat is preserved."
echo
echo "Options:"
echo " -h, --help display this help and exit"
echo " -V, --version output version information and exit"
echo " -r, --recursive operate recursively on directories"
echo
echo "Report bugs to zutils-bug@nongnu.org"
echo "Zutils home page: http://www.nongnu.org/zutils/zutils.html"
exit 0 ;;
--version | --ve* | -V)
echo "Zcat (zutils) VERSION"
echo "Copyright (C) 2009 Antonio Diaz Diaz."
echo "This script is free software: you have unlimited permission"
echo "to copy, distribute and modify it."
exit 0 ;;
- | -c | --st* | -d | --de* | -f | --fo* | -q | --qu* | -L | --lic* )
;;
-l | --lis*)
gz_args="${gz_args} $1"; xz_args="${xz_args} $1" ;;
-r | --re*)
recursive=1 ;;
--)
shift ; two_hyphens=1 ; break ;;
-?*)
args="${args} $1" ;;
*)
break ;;
esac
shift
done
if [ $# = 0 ] ; then
bindir=`echo "$0" | sed -e 's,[^/]*$,,'`
prog_name=`"${bindir}"zutils -t`
case "${prog_name}" in
bzip2) prog="bzip2 -cdfq" ;;
gzip) prog="gzip -cdfq ${gz_args}" ;;
lzip) prog="lzip -cdfq" ;;
xz) prog="xz -cdfq ${xz_args}" ;;
*) prog=cat ;;
esac
{ "${bindir}"zutils -m ${prog_name} ; cat ; } | ${prog} | cat ${args}
exit $?
fi
retval=0
for i in "$@" ; do
if [ "$i" = "--" ] && [ ${two_hyphens} = 0 ] ; then two_hyphens=1
else
if [ ! -f "$i" ] ; then
if [ -f "$i.gz" ] ; then i="$i.gz"
elif [ -f "$i.bz2" ] ; then i="$i.bz2"
elif [ -f "$i.lz" ] ; then i="$i.lz"
elif [ -f "$i.xz" ] ; then i="$i.xz"
elif [ ${recursive} = 1 ] && [ -d "$i" ] ; then
find "$i" -type f -exec "$0" '{}' ';'
continue
else
echo "$0: File \"$i\" not found or not a regular file" 1>&2
if [ ${retval} = 0 ] ; then retval=1 ; fi
continue
fi
fi
bindir=`echo "$0" | sed -e 's,[^/]*$,,'`
prog_name=`"${bindir}"zutils -t -- "$i"`
case "${prog_name}" in
bzip2) prog="bzip2 -cdfq" ;;
gzip) prog="gzip -cdfq ${gz_args}" ;;
lzip) prog="lzip -cdfq" ;;
xz) prog="xz -cdfq ${xz_args}" ;;
*) prog=cat ;;
esac
${prog} -- "$i" | cat ${args}
r=$?
if [ $r != 0 ] ; then retval=$r ; fi
fi
done
exit ${retval}
|
