cat text
1
2
11
22
111
222
$sed ‘/1/{H;$!d};$p;$x‘ text
2
22
222
1
11
111
$sed ‘/2/{H;$!d};$x‘ text
1
11
111
2
22
222
$sed ‘H;$!d;${x;s/^\n//;s/\n/,/g}‘ text
1,2,11,22,111,222
$function join_lines()
> {
> sed ‘H;$!d;${x;s/^\n//;s/\n/,/g}‘ $1
> }
$join_lines text
1,2,11,22,111,222
$ function join_lines()> {> local delim=${1:-,}> sed ‘H;$!d;${x;s/^n//;s/n/‘$delim‘/g}‘> }$ cat text | join_lines ‘;‘1;11;2;11;22;111;222
$ function join_lines()
> {> local delim=${1:-,}> sed ‘H;$!d;${x;s/^n//;s/n/‘$delim‘/g}‘> } $ cat text | join_lines ‘&‘1&11&2&11&22&111&222
原文：http://www.cnblogs.com/fanyl5/p/4795640.html