给Shell编程初学者 1

[AWolfBoy]

转贴：sed 与 unix 命令等价代码鉴赏
http://www.chinaunix.net 作者:admirer 发表于：2004-04-18 21:19:20

UNIX         |  SED 
 -------------+---------------------------------------------------------------- 
 cat            |  sed ':' 
 cat -s        |  sed '/./,/^$/!d' 
 tac            |  sed '1!G;h;$!d' 
 grep          |  sed '/patt/!d' 
 grep -v      |  sed '/patt/d' 
 head         |  sed '10q' 
 head -1     |  sed 'q' 
 tail             |  sed -e ':a' -e '$q;N;11,$D;ba' 
 tail -1        |  sed '$!d' 
 tail -f         |  sed -u '/./!d' 
 cut -c 10    |  sed 's/\(.\)\{10\}.*/\1/' 
 cut -d: -f4  |  sed 's/\(\([^:]*\):\)\{4\}.*/\2/' 
 tr A-Z a-z   |  sed 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/' 
 tr a-z A-Z   |  sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' 
 tr -s ' '        |  sed 's/ \+/ /g' 
 tr -d '\012' |  sed 'H;$!d;g;s/\n//g' 
 wc -l           |  sed -n '$=' 
 uniq           |  sed 'N;/^\(.*\)\n\1$/!P;D' 
 rev             |  sed '/\n/!G;s/\(.\)\(.*\n\)/&\2\1/;//D;s/.//' 
 basename  |  sed 's,.*/,,' 
 dirname     |  sed 's,[^/]*$,,' 
 xargs          |  sed -e ':a' -e '$!N;s/\n/ /;ta' 
 paste -sd:  |  sed -e ':a' -e '$!N;s/\n/:/;ta' 
 cat -n          |  sed '=' | sed '$!N;s/\n/ /' 
 grep -n       |  sed -n '/patt/{=;p;}' | sed '$!N;s/\n/:/' 
 cp orig new|  sed 'w new' orig