List all open files by process
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# What processes have open files?
function openfiles {
if [ "${1}" = "-h" ]; then
echo -e "Usage: openfiles [r|w|m|R|W] regex\n -r opened for reading or read/write\n -w opened for writing or read/write\n -m accessed from memory (includes running command)\n -R opened for reading only\n -W opened for writing only"
return
fi
if [ "$#" = "0" ]; then
echo "Process signature/regex required."
return
fi
MODE="(w|u)"
ACTION="for writing"
if [ "${1}" = "r" ]; then
MODE="(r|u)"
ACTION="for reading"
shift
elif [ "${1}" = "R" ]; then
MODE="r"
ACTION="for reading (only)"
shift
elif [ "${1}" = "W" ]; then
MODE="w"
ACTION="for writing (only)"
shift
elif [ "${1}" = "m" ]; then
MODE="(txt|mem)"
ACTION="in memory"
shift
elif [ "${1}" = "w" ]; then
shift
fi
if [ "${MODE}" != "(txt|mem)" ]; then
MODE="[0-9]+${MODE}"
fi
PIDS=$(pgrep -d "," -f "${@}")
if [ "${PIDS}" = "" ]; then
echo "No processes found matching '${@}'."
return
fi
OPENFILES=$(lsof -PXn -p "${PIDS}" | egrep "${MODE}[A-Za-z]* +REG" | awk '{print $9}' | egrep -v "^\[" | sort | uniq);
if [ "${OPENFILES}" = "" ]; then
echo "No files opened ${ACTION}."
else
echo "Files opened ${ACTION}:"
ls -ahl "$OPENFILES"
fi
}
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List all open ports
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# What processes are listening on what ports?
function listening {
if [ "${1}" = "-h" ]; then
echo "Usage: listening [t|tcp|u|udp] [ps regex]"
return
fi
DISP="both"
NSOPTS="tu"
if [ "${1}" = "t" -o "${1}" = "tcp" ]; then
DISP="tcp"
NSOPTS="t"
shift
elif [ "${1}" = "u" -o "${1}" = "udp" ]; then
DISP="udp"
NSOPTS="u"
shift
fi
FILTER="${*}"
PORTS_PIDS=$(netstat -"${NSOPTS}"lnp | tail -n +3 | tr -s ' ' | sed -n 's/\(tcp\|udp\) [0-9]* [0-9]* \(::\|0\.0\.0\.0\|127\.[0-9]*\.[0-9]*\.[0-9]*\):\([0-9]*\) .* \(-\|\([0-9-]*\)\/.*\)/\3 \1 \5 \2/p' | sed 's/\(::\|0\.0\.0\.0\)/EXTERNAL/' | sed 's/127\.[0-9]*\.[0-9]*\.[0-9]*/LOCALHOST/' | sort -n | tr ' ' ':' | sed 's/::/:-:/' | sed 's/:$//' | uniq)
PS=$(ps -eo pid,args)
echo -e ' Port - Protocol - Interface - Program\n-----------------------------------------------'
for PORT_PID in ${PORTS_PIDS}; do
PORT=$(echo "${PORT_PID}" | cut -d':' -f1)
PROTOCOL=$(echo "${PORT_PID}" | cut -d':' -f2)
PID=$(echo "${PORT_PID}" | cut -d':' -f3)
INTERFACE=$(echo "${PORT_PID}" | cut -d':' -f4)
if [ "${PROTOCOL}" != "${DISP}" -a "${DISP}" != "both" ]; then
continue
fi
if [ "${PID}" = "-" ]; then
if [ "${FILTER}" != "" ]; then
continue
fi
printf "%7s - %8s - %9s - -\n" "${PORT}" "${PROTOCOL}" "${INTERFACE}"
else
PROG=$(echo "${PS}" | grep "^ *${PID}" | grep -o '[0-9] .*' | cut -d' ' -f2-)
if [ "${FILTER}" != "" ]; then
echo "${PROG}" | grep -q "${FILTER}"
if [ $? -ne 0 ]; then
continue
fi
fi
printf "%7s - %8s - %9s - %s\n" "${PORT}" "${PROTOCOL}" "${INTERFACE}" "${PROG}"
fi
done
}
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Compress files with progress
This uses pigz (link ) for multithreaded compression and pv (man page ) to show progress.
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# for a directory
tar cf - /folder-with-big-files -P |\
pv -s $(du -sb /folder-with-big-files |\
awk '{print $1}') |\
pigz --best > big-files.tar.gz
# for a single big file, like a VM HDD
tar cf - vm-image.img -P |\
pv -s $(du -sb vm-image.img |\
awk '{print $1}') |\
pigz --best > vm-image.tar.gz
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Output looks like this:
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18.7GiB 0:03:20 [82.8MiB/s] [======> ] 15% ETA 0:34:56
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Strings that appears most in log file
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# search
grep -o 'string' file |\
# sort
sort |\
# deduplicate
uniq -c |\
# sort by count
sort -nr |\
# show top 25
head -n 25
# now in practice for which repos are accessed the most by `git`
grep -o 'repo=[^ ]*' /var/log/babeld/babeld.log |\
sort |\
uniq -c |\
sort -nr |\
head
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