Bash cheat sheet

pwd

- Print working directory, outputs the path to the current directory

tree <path>

- See how the child files are organized from the current directory

cd <path>

- Change directory, changes current directory to the file path given

ls <path>
ls -a <path>

- Lists the files contained in current directory - Use -a to show hidden files

mkdir <flags> <path(s)>

- Makes directory, a new directory at the file path given

mv <flags> <sourcePath(s)> <destinationPath>

- Moves files from source to destination - Can rename / overwrite files

cp <flags> <sourcePath(s)> <destinationPath>

- Copy files / directories - Can overwrite existing files

rm <flags> <filePath(s)>

- Remove each specified file permanently - Does not remove directories by default

alias <aliasName>='<commandToRun>'

- Substitutes the alias name with the command to be run - Create shortcuts for tedious commands - Extend the default behavior of commands

alias rm='rm -i'          # confirm to delete file
alias rm='mv -t -/.tash'  # move file to a trash directory
alias cp='cp -b'          # make backup of destinationFile
alias mv='mv -u'          # move only if sourceFile is newer
alias hello="echo 'cow power'"

cat <flags> <file>
less <flags> <file>

- Print contents of file to screen; concatenate - less outputs a page at a time, to scroll through - Can search through file using the /<word>

head <flags> <file>

- Shows the first 10 lines of a file - Use -n <number of lines> to print certain number of lines from file

tail <flags> <file>

- Shows the last 10 lines of a file

nano <flags> <file>

- Opens simple CLI text editor

vim <flags> <file>

- Another text editor

man <command>
man mkdir
man stdio

- System reference manuals - Contains details of all command behavior and flags - Documentation of c libraries

tldr <flags> <command>

- Lists the typical uses of a command

grep 'word-to-search' <file_name>
grep 'word-to-search' <file_name1> <file_name2> <file_name3> ...
grep 'pattern' <file_name>      # searches by regex pattern

- Searches the given files for lines containing a match to a given pattern list ¹

grep 'Gandalf' list_of_dwarves.txt 

if [[ $? != 0 ]] 
then 
    echo "Gandalf is not a dwarf" 
    exit 1 
else 
    echo "Gandalf is a dwarf" 
    exit 0 
fi

- $? stores the exit code for the last command

p10k configure

- Configure powerlevel10k looks

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1. https://www.cyberciti.biz/faq/grep-in-bash/ ↩