Psingh12354 / Shell-Scripting

Shell-Scripting(Linux)

Notes

• Case sensitive

• Terminal open = CTRL + ALT + T

• In linux we have tree like structures for files

• In linux we call directory not folder like in windows

• (.) it represent current directory

• (..) it represent parent direcotry

• Path

  • Absolute -: start from root ~
  • Relative -: start from the current working dir /
  • CTRL + C-: kill process

• Types of Linux Command

  • Executable program which is in bin/userbin. example-: cp,wc
  • Shell buttons built in shell example-: cd,mv
  • Shell Scripts files that contains codes
  • Alias command that we can define by our own like example given in last commands section below

Commands

• pwd print working directory gives the absolute path from the root
• date
• cal -y
• clear to clear the shell
• ls list the dir
• ls -l all non hidden file
• ls -a hidden file
• ls -la combo of above two
• cd change dir
• cd.. to move one step toward root
• cd~ move directly to home
• cd / go to root dir
• cd - to get prev working dir
• touch filename to create a file to update filename same command
• cat > file.txt
• cat "hello" > hello.txt
• touch file1 file2 multiple file creation
• mkdir dir To create dir
• rmdir dirname To removedir only work with empty dir
• rmdir -R dir remove all subdirectory
• rm -i file prompt base Y or N
• rm -f file
• rm -rf / delete everthing
• cp oldfile newfile
• cp -R dir1 dir2 to copy folder
• mv oldfile newfile rename also can be done
• mkdir 'my dir' to give space between file name
• rmdir "my cat"
• history
• history -c to delete history
• cat file1 file2 to read multiple file from l to r
• which cp to get absolute path
• help cd to get detail of cd
• man cp to get manual
• man cd
• whatis cp to get brief of cp
• ifconfig linux and ipconfig windows
• date;time ';' it is for sepration not termination
• alias dat="date" it create a command dat which perform date operaton *

Shortcut key

• CTRL + A move to very beggining of line.
• CTRL + D to remove next char
• CTRL + E move to last element
• CTRL + F move one char forward
• CTRL + B move one char backward
• ALT + U upper case
• ALT + L Lower case
• CTRL + U cut from right to left
• CTRL + V paste
• clear or CTRL + L

Text editior

• gedit filename
• nano filename
• vi filename
• vim filename advance vi
• CTRL + O save
• CTRL + X exit