Some command.

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grep -I abc *

echo –e”/n123” -e

-e enable interpretation of backslash escapes

diff –s –I abc file1 file2

-I RE --ignore-matching-lines=RE

Ignore changes whose lines all match RE.

-s --report-identical-files

Report when two files are the same.

-s file The file size is not 0

-d file The file is directory

-f file The file is normal file,not directory

命令的条件执行

&& 如果第一条命令执行成功，就执行后面的命令

|| 如果第一条命令执行失败，则后面命令也要执行

[[ -s ${curr_Msg%.*}.dec ]] && [[ -s ${curr_Msg%.*}.dec.latest ]] && diff ${curr_Msg%.*}.dec ${curr_Msg%.*}.dec.latest >${curr_Msg%.*}.dec.latest.diff

cc prog.c >& err || mail bob <err

linux文件打包

把整个文件夹 folderTared 的内容打包成一个gz文件：
tar czvf folderTared.tar.gz /theDir/folderTared
把压缩的gz文件恢复到指定目录下：
tar xzvf folderTared.tar.gz /theDir/

uname -a

HP-UX csdc-097 B.11.11 U 9000/785 2013254652 unlimited-user license