Usefull linux commands/tricks

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These are some sort of notes to myself, this list will be constantly updated.

Sort directories by size (human readable size):

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# du --max-depth=1 -h |sort -hr

Set tabsize to 4 in vim:

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:set tabstop=4

Show failed login attempts on your machine:

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# lastb -F

Print the most recent login of all users and of a given user:

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# lastlog
lastlog -u USERNAME
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$ curl -d "param1=value1&param2=value2" http://example.com/
$ curl -X POST -d @filename http://example.com/

Return current SSID

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iwconfig wlan0 | awk -F':' '/ ESSID/ {print $2}' | tr -d '"'

Force a reboot:

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# echo 1 > /proc/sys/kernel/sysrq
# echo b > /proc/sysrq-trigger

Force a shutdown:

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# echo 1 > /proc/sys/kernel/sysrq
# echo o > /proc/sysrq-trigger
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find . -maxdepth 1 -type d -exec basename {} \;|xargs -L 1 -I '{}' chown {}:{} {}

Print text at LINE_NUMBER in a huge file

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awk 'NR >= LINE_NUMBER && NR <= LINE_NUMBER' data.txt
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