sed 2合1

1cpuer

# [ /home/soio/1bs/awks ] {2018-08-18 14:43:36}
: 1534574616:0;➜  cat sed.N                       
N：
Add a newline to the pattern space,
then append the next line of input to the pattern space.
If there is no more input then sed exits without processing any more commands.

#--#
# [ /home/soio/1bs/awks ] {2018-08-18 14:43:47}
: 1534574627:0;➜  sed '=' sed.N | sed 'N;s/\n/--/'
1--N：
2--Add a newline to the pattern space,
3-- then append the next line of input to the pattern space.
4--If there is no more input then sed exits without processing any more commands.

# [ /home/soio/1bs/awks ] {2018-08-18 14:48:58}
: 1534574938:0;➜  sed '=;{N;s/\n/ /}' sed.N
1
N： Add a newline to the pattern space,
3
then append the next line of input to the pattern space.  If there is no more input then sed exits without processing any more commands.



# [ /home/soio/1bs/awks ] {2018-08-18 14:48:47}
: 1534574927:0;➜  sed '=;/^[0-9][0-9]*/N;s/\n/ /' sed.N
1
N：
2
Add a newline to the pattern space,
3
then append the next line of input to the pattern space.
4
If there is no more input then sed exits without processing any more commands.

想把她 2合1 失败了

baby_神

cat -n /etc/passwd | sed -r 's/^ +//;s/([0-9]+)[^ ]/\1--/'

1cpuer

回复 2# baby_神

# [ /home/soio/1bs/awks/ja1 ] {2018-08-18 17:35:36}
: 1534584936:0;➜  sed -r 's/^ +//;s/([0-9]+)[^ ]/\1--/' ../sed.N
N：
Add a newline to the pattern space,
then append the next line of input to the pattern space.
If there is no more input then sed exits without processing any more commands.

#--#
只是要 sed 模拟 cat | nl 输出 行号 ；1 行的