# Command Line Resources

## Command Line Article List (Under Construction)

* [SSH Examples, Tips & Tunnels](https://hackertarget.com/ssh-examples-tunnels/)
* [tldr in Go](https://github.com/isacikgoz/tldr)
* [the Art of Command Line](https://github.com/jlevy/the-art-of-command-line/blob/master/README-zh.md)
* [Search files in Linux](http://blog.jobbole.com/114561/)
* [Coupled commands with control operators in Bash](https://opensource.com/article/18/11/control-operators-bash-shell)
* [Top Ten One-Liners from CommandLineFu Explained](http://www.catonmat.net/blog/top-ten-one-liners-from-commandlinefu-explained/)
* [Bash Emacs Editing Mode Cheat Sheet](http://www.catonmat.net/blog/bash-emacs-editing-mode-cheat-sheet/)
* [Working Productively in Bash's Vi Command Line Editing Mode (with Cheat Sheet)](http://www.catonmat.net/blog/bash-vi-editing-mode-cheat-sheet/)
* [Helpful Terminal Commands for Beginners!](https://www.malikbrowne.com/blog/helpful-terminal-commands)

{% embed url="<https://linuxjourney.com/>" %}

{% embed url="<https://wangdoc.com/bash/index.html>" %}

awesome command line <https://www.kawabangga.com/posts/4012>

{% embed url="<https://blog.robertelder.org/data-science-linux-command-line/>" %}

The linux command line中文版书 <https://billie66.gitbooks.io/tlcl-cn/content/chap00/introduction.html>

The Unix Chainsaw - Gary Bernhardt <https://www.youtube.com/watch?v=sCZJblyT_XM>

IBM - Introduction to text manipulation on UNIX-based systems <https://www.ibm.com/developerworks/aix/library/au-unixtext/index.html>

PDF <https://www.ibm.com/developerworks/aix/library/au-unixtext/au-unixtext-pdf.pdf>

Unix text process <https://en.m.wikibooks.org/wiki/Ad_Hoc_Data_Analysis_From_The_Unix_Command_Line> <http://vegardstikbakke.com/unix/> <https://www.oreilly.com/openbook/utp/>

example <https://news.ycombinator.com/item?id=19160659>

`cat` is short for `concatenate`.

Shell 脚本学习指南

; is to separate commands in the same line & run the first command in background. Continue following commands (don’t wait the completion) Options with no arguments can be combined -l -t abc.c => -lt abc.c Echo \f 清屏

Command < file ( < change stdin)

> will create the file if not exist. If exist, will override

Pipe: faster x10 than temp file Use the command that would decrease the data first

不关心命令输出，只关心命令退出状态：> /dev/null

read password < /dev/tty 从终端读入密码 stty-echo / echo 关闭/打开 自动打印输入字符 PATH: 用:分开的一系列目录 用于查找命令 永久修改：加入bashrc PATH=$PATH:$HOME/bin

命令行参数 $1 ${10}

Who 显示所有用户

chapter2 Cc File.c | grep -v ^$ > file.c 删除空行并储存 -i 忽略大小写 -r 查找所有文件 -n 显示行数 -C5 显示上下文 5行

### Regex

{n} {n,} {n,m} ^ 在方括号内表示取反 <https://regex101.com/>

替换 sed

Cut

### cd

$ cd / # to the root $ cd \~ # to /User/davidfeng (home directory)

### ls

`ls -R` show all files in the subfolders. ls -lah \[name of file] # see the permissions

whoami # show the current user

chmod +rw # change mode: add/subtract permissions $ chmod u+x hello\_world.sh # u is user (myself)

$ which grep # where the command grep is installed? $ history # shows history of commands

move to the front/end of a command: ctrl +a/e

A better Mac Terminal experience <https://medium.com/@caulfieldOwen/youre-missing-out-on-a-better-mac-terminal-experience-d73647abf6d7>

终端使用技巧 <https://www.kawabangga.com/posts/2432>

\=> Unix shell fundamentals 9h command line programs including ls vi grep etc. <https://www.safaribooksonline.com/library/view/unix-shell-fundamentals/1930519915/c0000.html>

Shell十三问 <http://bbs.chinaunix.net/thread-218853-1-1.html> Linux C编程 <https://akaedu.github.io/book/index.html>

learn enough command line <https://www.learnenough.com/command-line-tutorial#sec-exercises_editing_the_line> Ten things I wish I knew about bash <https://zwischenzugs.com/2018/01/06/ten-things-i-wish-id-known-about-bash/> shellcheck <https://github.com/koalaman/shellcheck> safe way to do things in bash <https://github.com/anordal/shellharden/blob/master/how_to_do_things_safely_in_bash.md> <https://news.ycombinator.com/item?id=17057596>

bat is a better version of cat ack is a better version of grep

CLI improved 中文 <https://www.kawabangga.com/posts/3084> <https://remysharp.com/2018/08/23/cli-improved> <https://github.com/jlevy/the-art-of-command-line#one-liners> <https://henrikwarne.com/2018/08/11/my-favorite-command-line-shortcuts/> <http://www.catonmat.net/blog/bash-one-liners-explained-part-one/> <https://github.com/Bash-it/bash-it>

Learn Enough command line $ echo 1 > afile create a file named “afile” with content 1. If afile already exist, it overrides the content. echo 2 >> afile (append 2)

find .git/objects # find subfolders find .git/objects -type f # only find files, exclude directories <https://www.learnenough.com/command-line-tutorial> yes command: can take optional argument, output confirm messages until killed. man: manual space bar: turn to next page in a long doc. (man, cat, etc) q: quit ^: ctrl ^A: move to beginning of a line ^E: move to end of line ^U: clear the line from cursor to beginning option + left click: move the cursor move forward/backward by one word: mac terminal: option + left/right; iTerm2: esc + b/f

random source \~/.bashrc source can be replaced with a . => . \~/.bashrc

wc filename word count

kill a process kill -options id kill -15 12345 -15: gental kill. Give the process a chance to clean up temp files other options: 2, 1, 9

make a new bash command “ekill”: Listing 21: A custom escalating kill script. \~/bin/ekill 1 #!/bin/bash 2 3 # Kill a process as safely as possible. 4 # Tries to kill a process using a series of signals with escalating urgency. 5 # usage: ekill  6

## If the number of argument is less than 1, exit with a usage statement.

if \[\[ $# -lt 1 ]]; then echo "usage: ekill " exit 1 fi 7 # Assign the process id to the first argument. 8 pid=$1 9 kill -15 $pid || kill -2 $pid || kill -1 $pid || kill -9 $pid

To make ekill work: \~/bin is on the system path. echo $PATH if /Users/davidfeng/bin is not listed, edit bashrc export PATH="\~/bin:$PATH" # sometimes $HOME works instead of \~ make the script itself executable chmod +x \~/bin/ekill confirm: which ekill => gives the full path to the script

ps aux: show all processes tail: get a hanging process

curl -0L url/filename #download unzip xyz.zip

grep -n Waldo \* #-n for line number use grep in vim: -n is added automatically. -i: ignore case.