Using the Job Control of bash to send the process into the background: Ctrl+Z to stop (pause) the program and get back to the shell. bg to run it in the background. disown -h [job-spec] where [job-spec] is the job number (like %1 for the first running job; find about your number with the jobs … Read more
No need for basename, and especially no need for a subshell running pwd (which adds an extra, and expensive, fork operation); the shell can do this internally using parameter expansion: result=${PWD##*/} # to assign to a variable result=${result:-/} # to correct for the case where PWD=/ printf ‘%s\n’ “${PWD##*/}” # to print to stdout # … Read more
You can use Ctrl+U to clear up to the beginning. You can use Ctrl+W to delete just a word. You can also use Ctrl+C to cancel. If you want to keep the history, you can use Alt+Shift+# to make it a comment. Bash Emacs Editing Mode Cheat Sheet
Use “$@” to represent all the arguments: for var in “$@” do echo “$var” done This will iterate over each argument and print it out on a separate line. $@ behaves like $* except that when quoted the arguments are broken up properly if there are spaces in them: sh test.sh 1 2 ‘3 4’ … Read more
Very close to what you posted, actually. You can use something called Bash parameter expansion to accomplish this. To get the assigned value, or default if it’s missing: FOO=”${VARIABLE:-default}” # If variable not set or null, use default. # If VARIABLE was unset or null, it still is after this (no assignment done). Or to … Read more
Use “$@” instead of plain $@ if you actually wish your parameters to be passed the same. Observe: $ cat no_quotes.sh #!/bin/bash echo_args.sh $@ $ cat quotes.sh #!/bin/bash echo_args.sh “$@” $ cat echo_args.sh #!/bin/bash echo Received: $1 echo Received: $2 echo Received: $3 echo Received: $4 $ ./no_quotes.sh first second Received: first Received: second Received: … Read more
Simply type source ~/.bash_profile. Alternatively, if you like saving keystrokes, you can type . ~/.bash_profile.
set -x or set -o xtrace expands variables and prints a little + sign before the line. set -v or set -o verbose does not expand the variables before printing. Use set +x and set +v to turn off the above settings. On the first line of the script, one can put #!/bin/sh -x (or … Read more
*/ is a pattern that matches all of the subdirectories in the current directory (* would match all files and subdirectories; the / restricts it to directories). Similarly, to list all subdirectories under /home/alice/Documents, use ls -d /home/alice/Documents/*/
First redirect stderr to stdout — the pipe; then redirect stdout to /dev/null (without changing where stderr is going): command 2>&1 >/dev/null | grep ‘something’ For the details of I/O redirection in all its variety, see the chapter on Redirections in the Bash reference manual. Note that the sequence of I/O redirections is interpreted left-to-right, … Read more