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#!/bin/sh
show_usage()
{
cat <<__EOF__
Usage: ${0##*/} STRACE_LOG
Finds all STRACE_LOG.PID files, adds PID prefix to every line,
then combines and sorts them, and prints result to standard output.
It is assumed that STRACE_LOGs were produced by strace with -tt[t]
option which prints timestamps (otherwise sorting won't do any good).
__EOF__
}
if [ $# -ne 1 ]; then
show_usage >&2
exit 1
elif [ "$1" = '--help' ]; then
show_usage
exit 0
fi
logfile=$1
for file in "$logfile".*; do
[ -f "$file" ] || continue
suffix=${file#"$logfile".}
[ "$suffix" -gt 0 ] 2> /dev/null ||
continue
pid=$(printf "%-5s" $suffix)
# Some strace logs have last line which is not '\n' terminated,
# so add extra newline to every file.
# grep -v '^$' removes empty lines which may result.
sed "s/^/$pid /" < "$file"
echo
done \
| sort -s -k2,2 | grep -v '^$'
rc=$?
[ $rc -eq 1 ] &&
echo >&2 "${0##*/}: $logfile: strace output not found"
exit $rc
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