141 lines
3.3 KiB
Bash
141 lines
3.3 KiB
Bash
#!/bin/sh
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check=0
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pipe=0
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opt=
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files=
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keep=0
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res=0
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old=0
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new=0
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block=1024
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# block is the disk block size (best guess, need not be exact)
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warn="(does not preserve modes and timestamp)"
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tmp=/tmp/zfoo.$$
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echo hi > $tmp.1
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echo hi > $tmp.2
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if test -z "`(${CPMOD-cpmod} $tmp.1 $tmp.2) 2>&1`"; then
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cpmod=${CPMOD-cpmod}
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warn=""
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fi
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if test -z "$cpmod" && ${TOUCH-touch} -r $tmp.1 $tmp.2 2>/dev/null; then
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cpmod="${TOUCH-touch}"
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cpmodarg="-r"
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warn="(does not preserve file modes)"
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fi
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rm -f $tmp.[12]
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A=
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fileno=0
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for arg
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do
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case "$arg" in
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-*) opt="$opt $arg";;
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*) fileno=`expr $fileno + 1`
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eval A$fileno=\$arg
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A="$A \"\$A$fileno\""
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;;
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esac
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done
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if test $fileno -eq 0; then
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echo 'recompress .Z files into .gz (gzip) files'
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echo usage: `echo $0 | sed 's,^.*/,,'` "[-tv9P]" file.Z...
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echo " -t tests the new files before deleting originals"
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echo " -v be verbose"
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echo " -9 use the slowest compression method (optimal compression)"
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echo " -K keep a .Z file when it is smaller than the .gz file"
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echo " -P use pipes for the conversion $warn"
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exit 1
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fi
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eval set "$A" # the files are now in $1, $2, ...
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opt=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`
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case "$opt" in
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*t*) check=1; opt=`echo "$opt" | sed 's/t//g'`
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esac
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case "$opt" in
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*K*) keep=1; opt=`echo "$opt" | sed 's/K//g'`
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esac
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case "$opt" in
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*P*) pipe=1; opt=`echo "$opt" | sed 's/P//g'`
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esac
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if test -n "$opt"; then
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opt="-$opt"
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fi
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for i do
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n=`echo $i | sed 's/.Z$//'`
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if test ! -f "$n.Z" ; then
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echo $n.Z not found
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res=1; continue
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fi
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test $keep -eq 1 && old=`wc -c < "$n.Z"`
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if test $pipe -eq 1; then
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if gzip -d < "$n.Z" | gzip $opt > "$n.gz"; then
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# Copy file attributes from old file to new one, if possible.
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test -n "$cpmod" && $cpmod $cpmodarg "$n.Z" "$n.gz" 2> /dev/null
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else
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echo error while recompressing $n.Z
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res=1; continue
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fi
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else
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if test $check -eq 1; then
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if cp -p "$n.Z" "$n.$$" 2> /dev/null || cp "$n.Z" "$n.$$"; then
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:
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else
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echo cannot backup "$n.Z"
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res=1; continue
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fi
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fi
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if gzip -d "$n.Z"; then
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:
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else
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test $check -eq 1 && mv "$n.$$" "$n.Z"
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echo error while uncompressing $n.Z
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res=1; continue
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fi
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if gzip $opt "$n"; then
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:
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else
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if test $check -eq 1; then
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mv "$n.$$" "$n.Z" && rm -f "$n"
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echo error while recompressing $n
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else
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# compress $n (might be dangerous if disk full)
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echo error while recompressing $n, left uncompressed
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fi
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res=1; continue
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fi
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fi
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test $keep -eq 1 && new=`wc -c < "$n.gz"`
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if test $keep -eq 1 -a `expr \( $old + $block - 1 \) / $block` -lt \
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`expr \( $new + $block - 1 \) / $block`; then
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if test $pipe -eq 1; then
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rm -f "$n.gz"
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elif test $check -eq 1; then
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mv "$n.$$" "$n.Z" && rm -f "$n.gz"
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else
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gzip -d "$n.gz" && compress "$n" && rm -f "$n.gz"
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fi
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echo "$n.Z smaller than $n.gz -- unchanged"
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elif test $check -eq 1; then
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if gzip -t "$n.gz" ; then
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rm -f "$n.$$" "$n.Z"
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else
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test $pipe -eq 0 && mv "$n.$$" "$n.Z"
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rm -f "$n.gz"
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echo error while testing $n.gz, $n.Z unchanged
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res=1; continue
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fi
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elif test $pipe -eq 1; then
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rm -f "$n.Z"
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fi
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done
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exit $res
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