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--- ./bookman.orig
+++ ./bookman
@@ -83,9 +83,9 @@
shift $(($OPTIND - 1))
date=${date:-$(date +'%d %B %Y')}
-[[ $1 ]] || set -- $(while read; do echo $REPLY; done)
+[ -n "$1" ] || set -- $(while read REPLY; do echo $REPLY; done)
-[[ $outfile ]] && post="$post >$outfile"
+[ -n "$outfile" ] && post="$post >$outfile"
{
# Compute table of content from postscript output.
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