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SED: Stream Editor for Text Manipulation/shaare/Uadn6w

  • linux
  • linux

  • Basic Replace Syntax:

    • sed -i 's/KENNY/LENNY/g' filename

    • Substitute all occurrences of "KENNY" with "LENNY"

  • Delete Line Containing String:

    • sed -i '/SEINFELD/d' filename
  • Delete Empty Lines:

    • sed -i '/^$/d' filename
  • Delete First Line:

    • sed '1d' filename
  • sed '1,2d' filename → delete the first two lines

  • sed 's/\t/ /g' filename → replace tabs with spaces

  • sed -n '12,18p' filename → print only lines 12 to 18

  • sed '12,18d' filename → delete lines 12 to 18

  • sed G filename → insert an empty line after every line

  • sed '8!s/seinfeld/S1/' filename → replace "seinfeld" with "S1" on every line except line 8

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  • Special Permissions (SetUID, SetGID, Sticky Bit) : chmod u+s xyz.sh → add SetUID (user-level special permission) chmod g+s xyz.sh → add SetGID (group-level special permission) chmod u-s xyz.sh → remov...
  • System information, root recovery, environment variables, shortcuts : Finding System Information cat /etc/redhat-release → Red Hat version uname -a → Linux hostname, kernel, architecture dmidecode → hardware, BIOS, syst...
  • User management : Essential Commands: useradd, groupadd, userdel, groupdel, usermod Modify 3 files: /etc/passwd, /etc/group, /etc/shadow Create User with Custom O...
  • Systemctl, process management : Basic System Info Commands uptime → time, uptime, users, load average hostname → current hostname ip hostname → show IP & hostname uname -a → current...
  • Vi Editor : Vi Editor Commands i → insert mode I → insert at line start ESC → escape to command mode R → replace mode x → delete character dd → delete line yy → ...


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