Linux Cheatsheet

File Management

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# Using  SCP Transfer
    - scp -P 2322  file.txt   calvchen@10.224.10.10:/home/calvchen/

# Folder Accesibility
    - chmod 755 function.sh --- rwx = 4 + 2 + 1
    
# Count Files under directory
    - ls | wc -l
    
# Folder Size
    - du -sh *   # or 
    - du -h --max-depth=1
    
# Find files not end with sth
    - find . -not -name "*.jpg"
    
# Find command
    - which or whereis
    

Rename Files in Batch

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# atb_mod_01.cpp  atb_mod_02.cpp  atb_mod_03.cpp  atb_mod_04.cpp
rename mod adb *  #
# atb_adb_01.cpp  atb_adb_02.cpp  atb_adb_03.cpp  atb_adb_04.cpp

Vim

vim + filename

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I  --  Edit mode
:  --  Command          # e.g. :wq
    q --  exit
    w -- reserve

o  -- insert a blank line in view mode

gg -- Move the first line
G  -- Move the last line

d  -- Delete mode       # e.g. ggdG
y  -- Copy mode         # e.g. ggyG, copy the selected content to cache
yy -- Copy whole line   # 3yy for copy 3 lines
p  -- Paste

/ -- find text, n(next), N(last)
    /hello\>  --- find start with hello
    /^hello   --- find head of the line
    /world$   --- find end of the line

u -- undo
Ctrl + r -- Redo (not confirmed)

Shift/ Move Cursor

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w --- next word
b --- last word
CTRL + a --- first word
CTRL + e --- end word

)(       --- move by sentense

CTRL + w --- delete the left word
CTRL + k --- clean the word to the right

SHIFT + PageUp/ PageDwon

fx - jump to the previous occurrence of character x
Fx - jump to the previous occurrence of character x

Linux Command

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# Find cmd history
    - CTRL + r
  
# Diff files
    # -y indicates parallel display, -W for the display width
    - diff log2014.log log2013.log  -b -B -H -y -W 50

# Generate SSH
    - ssh-keygen

Grep / save to text

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# find files with string inside
    - grep -r "string" dir 
    
# Search by tag
    - grep MYDEBUG file1 file2 -r | grep -v TAG
    
# find conditions and save to files
    - grep -E "some thing|some other thing" origin.txt  >> target.txt

Env Control

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# User Env
    - vim ~/.bashrc --- check env variable 

# Make Alias
    - vim ~/.bashrc
    - alias home="cd /home/calvchen"
    - source ~/.bashrc

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Zip and Unzip

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# zip
# Handling Zip Bomb
zip -FF 210211.zip --out 210211-2.zip -fz
# tar
tar --jcv -f filename.tar.bz2 文件 压缩
tar -jxv -f file.tar.bz2 -C 解压缩
tar -jtv -f 文件  查看