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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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type partial command, kill this command, check something you forgot, yank the command, resume typing.
Example : $ vim /etc/fstab ## damn $ $ sudo ## like a boss. Example 2 : $ sudo vim /root/bin/ ##uh... autocomplete doesn't work... $ $ sudo ls /root/bin ##ah! that's the name of the file! $ sudo vim /root/bin/ ##resume here! Thanks readline!

Recursive find and replace file extension / suffix (mass rename files)
Find recursively all files in ~/Notes with the extension '.md' and pipe that via xargs to rename command, which will replace every '.md' to '.txt' in this example (existing files will not be overwritten).

Display duplicated lines in a file
Displays the duplicated lines in a file and their occuring frequency.

list block devices
Shows all block devices in a tree with descruptions of what they are.

Console clock
Shows a simple clock in the console -t param removes the watch header Ctrl-c to exit

wget download with multiple simultaneous connections

Swap a file or dir with quick resotre
This lets you replace a file or directory and quickly revert if something goes wrong. For example, the current version of a website's files are in public_html. Put a new version of the site in public_html~ and execute the command. The names are swapped. If anything goes wrong, execute it again (up arrow or !!).

recursively change file name from uppercase to lowercase (or viceversa)
easier way to recursively change files to lowercase using rename instead

Find partition name using mount point
lsblk | grep mountpoint

Ask user to confirm
This version works across on all POSIX compliant shell variants.


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