如何实现对文件的词组查找并替换？

ilhy

实现对一个文件的一个词组查找并替换
c shell:

#!/bin/csh  
#replace all occurences of a word with another one

if($#argv != 4) then
  echo "Synopsis: $0 inFile word replacement outFile"
  exit
endif
set numLines = (`wc -l $1`)
@ i = 1
while ( $i <= $numLines[1])
  foreach word (`head -$i $1 | tail -1`)
    if( $word == $2) then
       set word = $3
    endif
    echo -n "$word " >> $4
  end
  echo >> $4   # newline
  @ i++
end