# Shell Scripts / Commands
# sed
Delete line with specific string:
sed -i '/sha/d' ./*.log
Delete line that not contain specific string:
sed -i '/sha\|cas/!d' ./*.log
# Check existing connections
The most netstat command can be used on ss as well
# Listening(-l) TCP(-t)/UDP(-u) Ports
netstat -tlnp | less
netstat -ulnp | less
# All Ports
netstat -nap | less
ss -nap | less
# IO Check:
iostat -m /dev/xvdb 1 | while read a; do echo "$a" | awk '/xvdb/ {print strftime("%Y-%m-%d %T")",", $2 }' >> $(date +'%Y-%m-%d')-iops.csv; done
# Or save it to a .csv files
iostat -m /dev/xvdb 1 | while read a; do echo "$a" | awk '/xvdb/ {sum += $2; n++; print strftime("%Y-%m-%d %T")",", sum / n",", $2 }' >> $(date +%Y-%m-%d)-iops-with-average.csv; done
# Some more useful commands
Kernal panic: dmesg
tail: tail -n 5
ls: ls -lhS (-S: ordering by size; -t: ordering by time)
grep: grep -c (-c: count only)
# Terminal Shotcut and Software’s Commands
# tmux
Attach and deattach the remote session (-t to attach specific session)
tmux a -d -t Wordspace
# System Backup
# Rsync
rsync --archive --one-file-system --hard-links \
--acls --xattrs --sparse \
--human-readable --numeric-ids --delete --delete-excluded \
--itemize-changes --verbose --progress \
--exclude='*~' \
--exclude-from=root.exclude \
src dest
Reference:
Last Update: 2024-11-10 22:37:01 Source File