Bash Basics - miraj/tools GitHub Wiki

1. Command History
   • history command
   • Browsing History using arrow keys
   • ctrl-R : to search in the history
2. !$ - for using the previous argument
3. echo
4. .bashrc
5. ls
   • ls -l
   • ls -lcrt
   • ls *.pl
   • ls *.p[lm]
   • who expands * to the filenames? ls command? or the shell?
6. Multiple commands in a single line

7. pipe
8. environment variables
   • PATH
   • HOME
   • HISTFILESIZE
9. cat, tail, head
10. > redirecting to a file
11. wc
12. find
13. locate, updatedb
14. man command, man pages
15. Soft Links
16. tail
17. File System
    • Access Rights
    • user, group, others
    • chmod, chown

1. Single quote and double quote
2. special charactors : *, $, [,]', , ", `
3. Command Terminators
   • newline
   • ;
   • &&
   • ||
4. Escape character
5. bg, fg, ctrl-Z, ctrl-C
6. grep
   • grep -i
   • grep -r
7. Variables
   • setting
   • viewing
   • scope
8. export. Why is it needed?
9. sed, awk

1. Arguments to a shell script: $0, $1, $2
2. $#, $*
3. Variables, export
4. Shell Scripts are executed in a subshell
5. source command. Why is it needed?
6. lists
7. if condition. if, fi
8. for
9. seq : iterating over numbers
10. Iterating over lines
11. procedures and arguments
12. redirection
13. redirection in for loop
14. Creating a block
15. redirection from a block.