Unix Shell find/xargs

// Solaris

 

1. find ./ -name "*.jar" -exec jar -tvf {} /;

 

For each file found from 'find' command, it will invoke a new process space to run 'tar -tvf ...'.

 

 

2. find ./ -name "*.jar" | xargs jar -tvf

把find的输出结果, 分批送给'jar -tvf' 执行

如果find出来两个文件(lib/a.jar, lib/b.jar), 那么上述命令相当于 jar -tvf lib/a.jar lib/b.jar

 

3. find ./ -name "*.jar" | xargs -t -I {} jar -tvf {}

    find ./ -name "*.jar" | xargs -t -I {} mv {} {}.bak

    -t 选项指示 xargs 先打印命令，然后再执行。

    -i 选项告诉 xargs 用每项的名称替换 {}

 

 

     // -I 每一行的输出都要执行jar的命令, 即每个发现的文件执行一次。

     -I replstr  Insert mode. utility is  executed  for  each
                     line  from standard input, taking the entire
                     line as a single argument, inserting  it  in
                     argument s for each occurrence of replstr. A
                     maximum of five arguments in  arguments  can
                     each   contain  one  or  more  instances  of
                     replstr. Any blank characters at the  begin-
                     ning  of  each line are ignored. Constructed
                     arguments cannot grow larger than 255 bytes.
                     Option  -x  is  forced  on.  The  -I  and -i
                     options are mutually exclusive; the last one
                     specified takes effect.