simple introduction for bash
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1. echo
-e escape character active
" \e[1;??mXXXXXXXX\e[0m" -> color
30m black
31m red
32m green
33m yellow
34m blue
35m magenta
36m cyan
37m white
2. script
#!/bin/bash -> must write on the first line
# -> notes
3. chmod 755 hello.sh -> grant permissions
./hello.sh -> excute script
4. bash hello.sh -> excute script via bash
5. alias -> display all the alias of commands
alias newname='oringin command' -> define the alias for command
eg. kk='ls --color=never' -> define the alias kk for ls --color=never
the alias just only in the memory, it will be deleted when restart if u only use alias command in the shell
6. unalias newname
delete the alias temporary if u dont delete the alias in the enviroment variable configuration file
6. vi ~/.bashrc
write environment variable configuration file in order to store the alias permanently
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