tr

名称:tr
  
  ### 1.比方说要把目录下所有的大写档名换为小写档名?
  
  似乎有很多方式,"tr"是其中一种:
  
  #!/bin/sh
  
  dir="/tmp/testdir";
  files=`find $dir -type f`;
  for i in $files
   do
   dir_name=`dirname $i`;
   ori_filename=`basename $i`
   new_filename=`echo $ori_filename | tr [:upper:] [:lower:]` > /dev/null;
   #echo $new_filename;
   mv $dir_name/$ori_filename $dir_name/$new_filename
   done
  
  
  ### 2.自己试验中...lowercase to uppercase
  
   tr abcdef...[del] ABCDE...[del]
   tr a-z A-Z
   tr '[:lower:]' '[:upper:]'
  
   shell>> echo "this is a test" | tr a-z A-Z > www
   shell>> cat www
   THIS IS A TEST
  
  ### 3.去掉不想要的字串
  
   shell>> tr -d this ### 去掉有关 t.e.s.t
   this
  
   man
   man
   test
   e
  
  ### 4.取代字串
  
   shell>> tr -s "this" "TEST"
   this
   TEST
   th
   TE