Bash Catch and Cheatsheet

Cheatsheet

Basics

From within a CLI(command line interface) environmentEcho

Print to Terminal

echo "some text"

echo "1\t2\t3"
1\t2\t3

echo -e "1\t2\t3"
1	2	3

Styling CLI

Text Color Codes

| color | code | | :-----: | :---: | | Reset | 0 | | black | 30 | | red | 31 | | green | 32 | | yellow | 33 | | blue | 34 | | magenta | 35 | | cyan | 36 | | white | 37 |

Example - Print out blue text

echo -e "\e[1;34m This is blue text \e[0m"
 This is blue text

Background Color Codes

| color | code | | :------ | :--- | | Reset | 0 | | black | 40 | | red | 41 | | green | 42 | | yellow | 43 | | blue | 44 | | magenta | 45 | | cyan | 46 | | white | 47 |

echo -e "\e[1;43m This is text has a yellow background \e[0m"
 This text has a yellow background

Basics Commands

> some-command some-option some-arguments

Get manual(documentation) for a given command.

man <some-command>

Get shell enviroment variables

Environmental : variables are variables that are defined for the current shell and are inherited by any child shells or processes. Environmental variables are used to pass information into processes that are spawned from the shell.

Shell variables : are variables that are contained exclusively within the shell in which they were set or defined. They are often used to keep track of ephemeral data, like the current working directory.

env

CLI Navigations

pwd
 # print working directory

cd
# change directory

cd -
# change to most recent directory

Working with Files

Save Result of Command to File

'command' /dir > file.txt
 # will save the return of the command to the defined file

Making Files and Directories

touch <my-file>
 # makes a file

touch {file1,file2,file3}
 touch {01..1000}
 # makes all three defined files

mkdir <directory-name>/
 # make a folder/directory

Organizing Files and Directories

mv <my-file> <directory-name>/
 # moves my-file to a given directory

cp <my-file> <directory-copy>/
 # copies given file to defined directory

cp -R /<source_folder> /<destination_folder>

cp -R <source_dir>/ <des_dir>/
# copyies contents of <source_dir> for <des_dir>

Example

cp -R ~/Documents ~/Documents-copy

rm <some-file>
 # removes defined file

rm -r some-directory
# removes defined directory and all children

cat some-file
 // returns contents of file

file some-file.type
 // returns file type
 // example
 file index.html
 return: index.html: ASCII text

vim some-file.type
// opens file in vim for editing

less some-file.type
// opens file in less for editing.
// note: in less 'h' opens up command navigation reference

bg
//(background) sends currently running script to the background

fg
//(foreground) brings scripts running in background to foreground

Functions

Bash

Echo

~ echo "some text"
// prints some text to the terminal

which

which some-command
// file path to command

Zsh

Commands

// zsh commands

man some-command
// opens manual for 'some-command'

whatis some-command
// brief descrption of command

Network Status Commands

netstat -ap tcp | grep -i "LISTEN"
//

netstat -ap tcp
//

sudo lsof -i -P -n | grep LISTEN
//

sudo lsof -PiTCP -sTCP:LISTEN
//command/app, PID, user, FD, TYPE, DEVICE, SIZE, NODE, NAME(PORT)

lsof -i tcp:<port>
//command/app, PID, user, FD, TYPE, DEVICE, SIZE, NODE, NAME(defined-PORT)

kill -9 <PID>
//kill by process ID

Reference

| Directory/Folder | Contents | | --------------------------------------------------------------- | ------------------------------------------ | | / | root | | /bin | binaries, programs | | /sbin | system binaries, system programs | | /dev | devices: hard drives, keyboard, mouse, etc | | /etc | system configurations | | /home | user home directories | | /lib | libraries of code | | /tmp | temporary files | | /var | variousr, mostly files the system uses | | /usr
/usr/bin
/usr/etc
/urs/lib
/urs/local | user programs, tools and libraries |

Resources and Reference

Tutorials Corses and Guides