Gilbertos Source

Basic Bash

Here are some basic terminal commands that save me up a lot of time.

Basics

Change directory: with no arguments, will take you to your home directory:

The tilde is a short for your home directory:

cd ~

The HOME variable is an environment variable that also points to your home directory:

cd ${HOME}

Using an environment variable to change to a directory:

cd ${HOME}/Documents

You can use echo to print:

echo Hello

Note how the value of environment variables are evaluated and printed:

echo ${HOME}/Documents

You can also unfold a number range:

echo {1..6}

And mix that to get numeric naming:

echo file_{1..6}.txt

You can use touch to create files:

touch file_{1..6}.txt

You can use ls to show the files:

The -l argument shows in list format:

ls -l

You can copy files with cp:

cp file_1.txt new_file.txt

You can move or rename files with mv:

mv file_1.txt new_file.txt

You can make directories with mkdir:

mkdir aux

You can make nested directories using the -p argument:

mkdir -p nested/directories/here

You can copy directories and their contents using -Rf:

cp -Rf nested copied_dir

You can move and rename directories and their contents using -f:

mv -f nested renamed_dir

You print to a file by using redirection:

echo Hello > my_file

You print the contents of a file by using cat:

cat my_file

You append contents to a file:

echo Hello >> my_file

And you can overwrite to a file:

echo overwrite > my_file

You can use grep to search inside files:

grep -rn Hello

You can see the history of commands you typed:

history

You can search through your command history using grep:

history | grep echo

You can print your command history to a file:

history > ${HOME}/my_command_history

You can count the number of lines of a file:

cat ${HOME}/my_command_history | wc -l

You can print your current directory:

pwd

You can edit a file using a GUI app:

gedit ${HOME}/my_command_history

You can use the * as a wild card, and remove all files in a directory:

rm *

File management

Remove all but macthing this

rm !(*macpddl)

Write to file

printf "when there will be old man old now old.\n" >> filename

Overwrite to file

printf "when there will be old man old now old.\n" > filename

Duplicate file

< filename tee filename{01..20}

Show content of multiple files

cat filename*

Remove multiple files

rm filename*

Downloading file to specific location

wget https://raw.githubusercontent.com/gilbertoamarcon/tools/master/terminal.sh -P ~/Downloads/

Create/Update all links in directory to point to a specific file

find . -type l -exec ln -sf ../../domain.macpddl {} ';' find . -type f -name 'domain.macpddl' -exec ln -sf ../../domain.macpddl {} ';'

Rename with regex

rename -n 's/^p(\d+)_s2_c(\d+)/P$1C$2/s' * rename 's/^p(\d)_c(\d)$/P0$1C0$2/s' * rename 's/^p(\d\d)_c(\d)$/P$1C0$2/s' * rename 's/^p(\d)_c(\d\d)$/P0$1C$2/s' *

History

Show command history

history

Execute previous command from history

Tar Balls

Creating tar ball

tar -cvzf tarball.tar.gz mobile/*

Extracting tar ball

tar -xvzf tarball.tar.gz

Follow this link for the raw script.