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BUT
Third, keep the space
- h / H hold, the contents of the pattern space covering h (additional H) into the holding space
- G / g get, covering the content holding space G (append G) to the pattern space
- x exchange, swap the contents of two spaces
- For example
- The multi-line use, splicing in a row
[root@localhost tmp]#sed 'H;${x;s/\n/,/g;s/^,//};$!d' test
- The line inversion output
[root@localhost tmp]#sed '1!G;h;$!d' test22
[root@localhost tmp]#sed -n '1!G;h;$p' test22
understanding
Fourth, change the flow
- Sed to change the default workflow (script execution from start to finish)
branch
unconditional jump
usage
[address] B [label]
label definitions
: LABEL
For example
test0311 file contents
This is the 0 header line.
This is the 100 first data line.
This is the 200 second data line.
This is the 300 last data line.
Unconditional jump
[root@localhost tmp]#sed '2,3b;s/This is/Is this/;s/line./test?/' test0311
Unconditional jump tagged
[root@localhost tmp]#sed '/first/b jump1;s/This is/Is this/;:jump1;s/line./test?/' test0311
Conditional jump
[root@localhost tmp]#echo "This, is , a, test, to, remove, coomas." | sed ':start;s/,//;t start'
- test
conditional jump to the specified label
Fifth, an alternative mode
- &
& Replace with regular matches to content
example
[root@localhost tmp]#sed -r 's/[0-9]+/&s/g' test0311
- \ 1 (backward reference)
example
[root@localhost tmp]#sed -r 's/(^.*)(\b[0-9]+\b )(.*$)/\2\1\3/g' test0311
[root@localhost tmp]#echo "abc 123 def" | sed -r 's/(^.*)(\b[0-9]+ \b)(.*$)/\2\1\3/g'
123 abc def
Six, sed N line of the two lines of data as processed
1. deleted from the string line breaks, resulting in two lines combined into one line
[root@localhost tmp]#sed '/first/{ N; s/\n/ /}' test
2. Replace character
[root@localhost tmp]#sed 'N ; s/this is/Is this/ ' test
