Common Commands
find
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| # find [path] [expression]
# find file in the current directory with name sample.txt and ignore error
find . -name sample.txt 2>/dev/null
find . -name "*.txt"
# find file by size
# c (for bytes) or k (for kilobytes) or M (for megabytes) or G (for gigabytes) suffix
find . -size +5G -size -10G
find ./ -type f -size 1033c ! -executable
find / -size 33c -user bandit7 -group bandit6 2>/dev/null
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file
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| file readme.md
# list file type in a directory
file ./-file*
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systemctl
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| # check status
systemctl list-units
systemctl status application.service
# check service config
systemctl cat application.service
# manage service
sudo systemctl start application.service
sudo systemctl stop application.service
sudo systemctl restart application.service
sudo systemctl reload application.service
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ref
journalctl
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| journalctl -u <service-name>
# -f: follow log
# -n 20: show 20 lines
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ref
ln
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| ln -s my_file.txt my_link.txt
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ps
Get process information
screen
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| # start a new screen
screen
# start a new screen with name
screen -S netcat
# list screen
screen -ls
# detach from a screen
# or Ctrl+C then d
screen -d netcat
# attach to a screen
screen -r netcat
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mount/unmount
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| sudo umount /media/external
sudo mount -t vfat /dev/sda1 /media/external -o uid=1000
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uniq
remove duplicate from a file
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| # output unique line
sort data.txt | uniq -u
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strings
output human readable character from a file (remove binary character)
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| strings data.txt | grep keyword
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