#Bash commands mac cheat sheet update#
#Bash commands mac cheat sheet manual#

G file # file's group ID matches yours (or one of yours, if you are in multiple groups)įile1 -nt file2 # file1 is newer than file2įile1 -ot file2 # file1 is older than file2įor (( initialisation ending condition update )) N file # file was modified since it was last read x file # you have execute permission on file, or directory search permission if it is a directory f file # file exists and is a regular file (i.e., not a directory or other special type of file) n str1 # str1 is not null (has length greater than 0)

o # or operator inside a test conditional expression a # and operator inside a test conditional expression Unset -f functname # deletes a function definitionĭeclare -f # displays all defined functions in your login session

$# holds the number of positional parameters. '$N', where N is the number of positional parameters. # The function refers to passed arguments by position (as if they were positional parameters), that is, $1, $2, and so forth. $(UNIX command ) # command substitution: runs the command and returns standard output !(patternlist) # matches anything except one of the given patterns ?(patternlist) # matches zero or one occurence of the given # matches exactly one of the given patterns +(patternlist) # matches one or more occurences of the given patterns *(patternlist) # matches zero or more occurences of the given patterns $ # returns the length of the value of the variable as a character string Varname=value command # defines a variable to be in the environment of a particular subprocessĮcho $varname # checks a variable's valueĮcho $$ # prints process ID of the current shellĮcho $! # prints process ID of the most recently invoked background jobĮcho $? # displays the exit status of the last commandĮxport VARNAME=value # defines an environment variable (will be available in subprocesses)Īrray = val # several ways to define an array Whois # gets whois information for domain Top # displays your currently active processesīg # lists stopped or background jobs resume a stopped job in the backgroundįg # brings the most recent job in the foreground Killall # kill all processes with the name Kill # kills (ends) the processes with the ID you gave Ps -u yourusername # lists your processes

#Bash commands mac cheat sheet manual#

Man # shows the manual for specified commandĭu # shows the disk usage of the files and directories in filename (du -s give only a total) Ssh-copy-id # adds your ssh key to host for user to enable a keyed or passwordless loginįinger # displays information about user Ssh -p # connects to host on specified port as user Grep -r # search recursively for pattern in directory Genscript # converts plain text files into postscript for printing and gives you some options for formattingĭvips # print. Lprm # remove something from the printer queue Gzcat # lets you look at gzipped file without actually having to gunzip it Gunzip # uncompresses files compressed by gzip Wc # tells you how many lines, words and characters there are in a fileĬhmod -options # lets you change the read, write, and execute permissions on your files Tail # outputs the last 10 lines of file (useful with -f option)ĭiff # compares files, and shows where they differ Head # outputs the first 10 lines of file More # shows the first part of a file (move with space and type q to quit) Ls -a # lists all files, including hidden files Ls -l # lists your files in 'long format', which contains the exact size of the file, who owns the file and who has the right to look at it, and when it was last modified Whereis bash # finds out where bash is on your systemĬlear # clears content on window (hide displayed lines) CTRL+D # deletes one character backward or logs out of current session, similar to exitĬTRL+G # aborts the current editing command and ring the terminal bellĬTRL+K # deletes (kill) forward to end of lineĬTRL+L # clears screen and redisplay the lineĬTRL+O # same as RETURN, then displays next line in history fileĬTRL+P # previous line in command historyĬTRL+U # kills backward from point to the beginning of lineĬTRL+V # makes the next character typed verbatimĬTRL+W # kills the word behind the cursorĬTRL+X # lists the possible filename completefions of the current wordĬTRL+Y # retrieves (yank) last item killedĬTRL+Z # stops the current command, resume with fg in the foreground or bg in the backgroundĮxport # displays all environment variablesĮcho $SHELL # displays the shell you're usingĮcho $BASH_VERSION # displays bash versionīash # if you want to use bash (type exit to go back to your normal shell)