command line ninja

command-line-ninja.md

Ctrl+

• Ctrl+U : This clears the entire line so you can type in a completely new command.
• Ctrl+K : This deletes the line from the position of the cursor to the end of the line.
• Ctrl+W : This deletes the word before the cursor only.
• Ctrl+R : This lets you search your command history for something specific. another press to browse in history
• Ctrl+A : Go to beggining of line
• Ctrl+E : Go to end of line
• Ctrl+L : clear the screen
• Ctrl+S : stops output to screen
• Ctrl+Q : resume output to screen

Process

• Ctrl+C : sends an INT signal. Causes the process to terminate
• Ctrl+Z : sends a TSTP signal. Causes the process to suspend execution
• Ctrl+T : sends an INFO signal. Causes the operating system to show information about the running command
• Ctrl+\ : sends a QUIT signal. Causes the process to terminate and dump core

Other tricks

• cd - : This will move you back to your last working directory:
• !! : represent the last command you ran. Ex: sudo !!
• !cat : run the last command that used cat
• !cat:p : see what the last cat command was
• !$ : represents the arguments from your last command. Ex: mkdir /new/folder && cd !$
• cat $(which rm): cat the result of which rm
• mv /path/to/file.txt /path/to/file.xml == mv /path/to/file.{txt,xml}
• cp /etc/rc.conf{,-old} == cp /etc/rc.conf /etc/rc.conf-old
• mv /etc/rc.conf{-old,} == mv /etc/rc.conf-old /etc/rc.conf
• mkdir myfolder{1,2,3} == mkdir myfolder1 && mkdir myfolder2 && mkdir myfolder3