Linux Command

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alias

Method 1: put your alias in .alias_pofile

Recommend use this file, will not destory .bashrc file. 

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cd ~
touch .alias_pofile

Method 2: edit .bashrc

This method need to reboot to take effect

change directory

change folder or directory

cd : change directory to home ~ directory
cd folder: change to specific directory

change upper directory

cd ..: change upper directory
cd ../..: change directory to 2 upper directory
cd ../folder: move upper directory and go to new direcotry
cat ../folder/filename: read upper directory filename

find

  • find file type .sh

    command:　find . -type f -name "*.sh"

dump or write file

EOF read multipy line into file

Example 1

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cat >>/etc/apt/sources.list<<EOF
######################
EOF

Example 2

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cat << EOF > /etc/samba/smb.conf
[global]
workgroup = WORKGROUP
map to guest = bad user
EOF

Write and Modify File

There are some shortcut key need to know using vi linux edit tool, which often use for edit file. Some people might use nano, nvim, or vim ; this is use for often vim.

  • Jump to specific line: ctrl+G + line
  • search string:
    • / or ?
    • search next match string: n
  • save file:
    • wq or x!: save and exit
    • q!: exit without saving
  • string select(visual mode): ctrl+v select cursor反白選取文字
    • copy: y
    • cut: d
    • paste: p
    • undo: u

modify file with advance tool

replace string from a file

  • Find and replace string to file
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    sed  -i 's/oldstring/newstring/g' xxx.txt
  • Search string, and replace with new string and value
    Search TddConfigCommon.PatternType = TDD2 and change value like P1 or P2
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    #change 
    sed -i "/TddConfigCommon.PatternType = /c\TddConfigCommon.PatternType = P1" /home/test/Desktop/5GScript/confChange.txt