SED-STREAM EDITOR

SED-STREAM EDITOR

Features:

1. Faciliates automated text editing

2. Supports RegExes (POSIX)

3. Like Awk, supports scripting using '-F' option

4. Supports input via: STDIN, pipe, file

Usage:

1. sed [options] 'instruction[s]' file[s]

2. sed -n '1p' grep1.txt - prints the first line of the file

3. sed -n '1,5p' grep1.txt - prints the first 5 lines of the file

4. sed -n '$p' grep1.txt - prints the last line of the file

5. sed -n '1,3!p' grep1.txt - prints ALL but lines 1-3

6. sed -n '/linux/p' grep1.txt - prints lines with 'linux'

7. sed -e '/^$/d' grep1.txt - deletes blank lines from the document

8. sed -e '/^$/d' grep1.txt > sed1.txt - deletes blank lines from the document
'grep1.txt' and creates 'sed1.txt'

9. sed -ne 's/search/replace/p' sed1.txt

10. sed -ne 's/linux/unix/p' sed1.txt

11. sed -i.bak -e 's/3/4' sed1.txt - this backs up the original file and creates
a new 'sed1.txt' with the modifications indicated in the command

Note:
1)Generally, to create new files, use output redirection, instead of
allowing sed to write to STDOUT
2)Sed applies each instruction to each line