sed

上級
1/7
user@linux:~/workspace$
sed 's/Linux/UNIX/' file.txt

Explanation

Replaces first occurrence of "Linux" on each line with "UNIX". Lines without Linux pass through unchanged.

Options

-nSuppress automatic printing
-iEdit file in place
-eMultiple expressions
gGlobal (all occurrences)
iCase-insensitive
pPrint matched lines
1Hello, World!
2This is a sample text file for practicing Linux commands.
3You can use commands like cat, head, tail, and grep on this file.
4
5Line 5: Learning Linux commands through typing practice.
6Line 6: WebContainers make it possible to run commands in the browser.
7Line 7: Practice makes perfect!
8Line 8: Keep typing to improve your speed and accuracy.
9Line 9: Linux is widely used in servers and development environments.
10Line 10: Mastering the command line is a valuable skill.