Linux Commands

What is ls and pwd command in Linux?

• ls – list directory contents
  • list the content of the directory.
  • for the manual page click here or run “man ls” in the terminal.
• pwd – print name of current/working directory
  • for the manual page click here or run “man pwd” in the terminal.

vim/vi editor commands.

• vim test.c //
  • creates a file with a name test.c and opens it in vim/vi editor if the file doesn’t present with the same name, if a file with name test.c is present already then shows its contents in vi editor
• vim then press ‘i’ key.
  • enter in insert mode, press ESC to come outside of insert mode

/* commands outside insert mode */

open vi the press below keys.

• w
  • advance to the next word
• e
  • advance to the end of the word
• e
  • move to the previous word
• yy
  • copy line, press p to paste it
• nyy
  • copy n lines after the cursor
• dd
  • delete the line, and press p to paste the deleted line
• ndd
  • deletes n lines after cursor
• u
  • undo last
• U
  • undo all changes to the current line
• o
  • add a new line below the cursor line
• O
  • add a new line above the cursor line
• /word
  • move to the occurrence of “word”, to search next occurrence press n
• :w
  • save changes
• :w [new]
  • save changes to a new file named “new”
• :wq
  • save and quit
• :q
  • quit
• :q!
  • quit without saving the changes
• click here to find more information about vim.

objdump command

• objdump – display information from object files
• click here to see the manual page or run man objdump on the terminal.