python 字符串连接 小知识点

删除 core 文件

# find ~ -name core -exec file {} \; -exec rm -i {} \;

查看使用文件的进程

# fuser -u /usr/my_application/foo

搜索字符串

#grep "hello world" `find ./ -name "*" -print -exec file {} \; |grep text | cut -d ':' -f 1`

目录

#alias dir='ls -Lla|grep ^d'

输出 IP 地址

#ifconfig | grep "inet addr" | grep -v "127.0.0.1" | awk '{print $2;}' | awk -F':' '{print $2;}'

按文件长度排序

#ls -l | grep ^- | sort -nr -k 5 | more

#ls -lR | grep ^- | sort -nr -k 5 | more

二进制文件中的可打印字符

# strings name of binary file

一个月的最后一个星期天执行任务：

18 * * * 0 [`date "+%d"` -gt 24] && /path/to/script

修改扩展名：

# for f in *.abc; do mv $f `basename $f .abc`.def ; done

查看硬盘情况：(Solaris)

# iostat -En

整个目录树拷贝：

# cd

# find . -depth -print | cpio -pudm

按长度排序目录下所有文件

# du -a | sort -n -r | more

检查文件内每行是否有相同列数

#awk '{print NF}' test.txt |sort -nu|more

去除空行

#sed -e '/^[ ]*$/d' InputFile >OutputFile

查看进程占用的对应文件 inode 号(Solaris)

#/usr/proc/bin/pfiles

删除指定用户的所有进程

# kill -9 `ps -fu username |awk '{ print $2 }'|grep -v PID`

Bash 操作快捷键：

ctrl-l -- clear screen

ctrl-r -- does a search in the previously given commands so that you don't

have to repeat long command.

ctrl-u -- clears the typing before the hotkey.

ctrl-a -- takes you to the begining of the command you are currently typing.

ctrl-e -- takes you to the end of the command you are currently typing in.

esc-b -- takes you back by one word while typing a command.

ctrl-c -- kills the current command or process.

ctrl-d -- kills the shell.

ctrl-h -- deletes one letter at a time from the command you are typing in.

ctrl-z -- puts the currently running process in background, the process

can be brought back to run state by using fg command.

esc-p -- like ctrl-r lets you search through the previously given commands.

esc-. -- gives the last command you typed.

文件名里的空格替换为下划线

# for i in $1 ; do mv "$i" `echo $i | sed 's/ /_/g'` ; done

查看远程主机时间

# telnet remotehostname 13|grep :

只显示 top 命令的states 行

#while true; do top -d 2 | col -b | grep states; sleep 10; done

加速显示　tar 文件内容

# tar tvfn

让 目录名也能　Spell Check

#shopt -s cdspell

当输错命令时，系统会自动进入类似的目录

查看　Sun 服务器型号

# /usr/platform/`uname -m`/sbin/prtdiag -v | grep `uname -m`

在vi 中一行文字前后添加字符

:/^\(.*\)/s//我要 \1 添加/

查找某包含字符串(Verita)软件包的详细信息 (Solaris)

pkginfo -l `pkginfo | grep -i VERITAS | awk '{print $2}'`

Sun 的一大堆脚本
 http://www.sun.com/bigadmin/scripts/index.html

#!/bin/sh
mysqldump  --opt --no-create-db --no-create-info --default-character-set=utf8 --extended-insert=0 -u user -ppassword database \
| grep 'INSERT' \
| sed -e "s/\\\'/''/g" -e "s/\\\r/\r/g" -e "s/\\\n/\n/g" -e 's/\\\"/"/g' > backup.sql