00:00:00 [migration/0]
root 3 1 0 03:45 ? 00:00:00 [ksoftirqd/0] root 4 1 0 03:45 ? 00:00:00 [events/0] root 5 1 0 03:45 ?00:00:00 [khelper]
root 6 1 0 03:45 ? 00:00:00 [kthread] root 9 6 0 03:45 ?00:00:00 [kblockd/0]
root 10 6 0 03:45 ? 00:00:00 [kacpid] 2 df -h 可读显示磁盘空间 M是兆 Filesystem Size Used Avail Use% Mounted on /dev/sda2 18G 5.0G 12G 31% / /dev/sda1 289M 16M 258M 6% /boot tmpfs 506M 0 506M 0% /dev/shm 3 借助df命令，能够方便地了解磁盘是否已空间不足，系统管理员须要了解空间不足时该怎么办。 我们能够使用du命令 ，du命令显示特定文件夹的磁盘使用情况，这是推断系统是否存在磁盘 占用大户的快捷方法。 du , du -h（显示M。G单位） ,du -c （汇总），du -s（汇总全部。仅仅显示一个） du [ -a | -s ] [ -k ] [ -m ] [ -g ][ -l ] [ -r ] [ -x ] [ -H | -L ][ File ... ] 8.0K ./test_flume/.flumespool 24K ./test_flume 8.0K ./mnt 58M ./awk 28K ./shell 18M ./spark 76M . 4 sort （排序） sort file.txt 默认按字符排序 数字排序 sort -n file.txt sort -n file2 0 2 3 5 6 7 9 17 sort -M file3.txt (依照月份排序) sort -t ':' -k 3 -n /etc/passwd 按指定分隔符':" 第三个字段进行排序 按数字排序的 du -sh * | sort -nr 按空间占用从大到小 排序 包含目录和文件 r是指降序排列 5 gzip ：用于压缩文件 gzip 2.sh gzip file* gzip -r test1 test2 压缩2个文件 tar -cvf my.tar my.sh tar压缩 tar -xvf my。tar tar解压
tar -zxvf filename.tgz 7 打印环境变量 printenv bash test=testing echo $test 7 finger llisc /usr/sbin/groupadd shared /usr/sbin/usermod -G shared test 文件权限表 755 chmod o+r newfile 将条目读取加入到不论什么人 chmod u-x newfile 将条目山下湖用户拥有的运行权限 chmod u+x newfile chown 改动用户文件拥有者 和所在组 9 shell rpm -qa | sort | more echo $? if 表达式 返回0 运行成功 then fi if test [ condition ] for var in Li72 Alibaba taobao Newbatilr do echo the state $test done 使用转移字符反斜杠符合来转移单引號 使用双引號来定义单引號的值 #!/bin/bash for file in /home/bigdata/test/* /home/li75/ do if [ -d "$file" ] then echo "$file is a directory " elif [ -f "$file" ] then echo "$file is a file " fi done #!/bin/bash for(( i=1; i<= 10; i++)) do echo " The next number is $i" done #!/bin/bash var1=10 while [ $var1 -gt 0 ] do echo $var1 var1=$[ $var1 - 1 ] done #!/bin/bash var1=100 until [ $var1 -eq 0 ] do echo $var1 var1 =$[ $var1 -25 ] done #!/bin/bash for((a =1; a<=3; a++)) do echo "starting loop $a:" for((b=1;b<=3;b++)) do echo " inside loop: $a*$b " done done break contince #!/bin/bash for(( a=1; a<4 ;a++)) do echo "Outer loop :$a" for((b=1;b<100;b++)) do if [ $b -gt 4 ] then break 2 fi echo "Inner loop :$b" done done > test.txt 重定向到一个文件 | sort 排序 參数 位置參数 $0 为为程序名称 $1 为第一个參数 $2 为第二个參数 $3 为第三个參数 #!/bin/bash factorial=1 for((number =1;number<= $1;number++)) do factorial=$[ $factorial * $number ] done echo The factorial of $1 is $factorial name =` basename $0` 获取执行shell 脚本名称 if [ -n "$1" ] 推断有没有传入參数 if [ $# <5 ] 推断传入參数个数 获取最后一个參数的值 params =$# echo parm : $params 或者 The last paramer ${!#} $* 把全部的參数当作一个參数 $@ 把全部參数当作字符串 分开处理 #!/bin/bash while [ -n "$1" ] do case "$1" in -a) echo "Found the -a option" ;; -b) echo "Found the -b option" ;; -c) echo "Found the -c option";; *) echo "$1 is not an option";; esac shift done #!/bin/bash echo -n 'Enter your name :" read name echo "Hello $name, welcome to my prorram ." #!/bin/bash read -p "Please enter your age :" age days =$[ $age * 365 ] echo " That makes you over $days days old !" ls -al test test22 test3 badtest &>test7 #!/bin/bash echo "This is an error " >&2 echo "This is normal output " #!/bin/bash exec 1>testout echo "This is a test of redirting all output" echo "without having to redirect every line " #!/bin/bash exec 2>testerror echo "This is the start of the script" echo "now reidirecting all output to another " exec 1>testout2 echo "This putput should go to the " echo "but shis should go to testerror file >&2 #!/bin/bash exec 0<testfile2 count=1 while read line do echo "Line #$count :$line" count=$[ $count +1 ] done lsof -a -p $$ -d 0,1,2 重定向到空文件 ls -al >/dev/null cat /dev/null > testfile 同一时候记录文件和打印到屏幕 date | tee testfile 追加数据 date | tee -a testfile kill -9 进程id #!/bin/bash trap "echo HaHa " SIGINT SIGTEERM echo "THis is a test program " count=1 while [ $count -le 10 ] do echo "Loop #$count" sleep 10 count=$[ $count +1 ] done echo "This is the end of test program " 把命令在后台执行用 & sh 37.sh & ps au 有时须要从终端启动会话，然后让脚本在结束之前以后台模式执行，即使退出终端会话有时如此 能够用nohup jobs jobs -r jobs -s jobs -l nice 设置优先级 nice -n 10 sh 38.sh >test4out & at 命令 batch 命令 cron 表格 #!/bin/bash time=`date +%T` echo "This script ran at $time " echo "This is the end of the script">&2 corn 表格使用特殊格式制定作业的时间。 15 10 * * * command 查看登陆用户配置的定时任务 crontab -l 编辑任务 corntab -e #!/bin/bash function func1 { echo 'This is an example of a function" } count=1 while [ $count -le 5 ] do func1 count=$[ $count +1 ] done echo "This is the end of the loop" func1 echo "Now this is the end of the script " 函数的返回值 $? #!/bin/bash func1(){ echo "trying to display a non" ls -ls 41.sh } echo "testing the function:" func1 echo "The exit status is :$?"
#!/bin/bash function db1 { read -p "Enter a value :" value echo "doubling the value " return $[ $value * 2 ] } db1 echo "The new value is $?" 函数返回值 #!/bin/bash function db1{ read -p "Enter a value :" value echo $ [ $value *2 ] } result='db1' echo 'The new value is $result" 提供函数文件 能够用source 命令或称（点操作符）将现有的库函数引进.bashrc中 source /home/li72/libraries/myfuncs . /home/li72/libraries/myfuncs function addem { echo $[ $1 +$2 ] } function multem { echo $[ $1 * $2 ] } function divem { if [ $2 -ne 0 ] then echo $[ $1 /$2 ] else echo -1 fi } #!/bin/bash . ./myfuncs result=`addem 10 16` echo "The result is $result" .bashrc 每次启动shell 都会检查该文件 ，在已有文件的末尾加入自己定义函数 . /home/bigdata/test/shell/myfuncs 文本处理 sed luinx 编辑替换 gawk echo "This is a test " | sed 's/test/big test/' cat>dog.txt The quick brown fox jumps over the lazy dog . The quick brown fox jumps over the lazy dog . The quick brown fox jumps over the lazy dog . The quick brown fox jumps over the lazy dog . The quick brown fox jumps over the lazy dog . sed 's/dog/cat/' dog.txt The quick brown fox jumps over the lazy cat . The quick brown fox jumps over the lazy cat . The quick brown fox jumps over the lazy cat . The quick brown fox jumps over the lazy cat . The quick brown fox jumps over the lazy cat . sed -e ' > s/brown/green/ > s/fox/elephant/ > s/dog/cat/' dog.txt The quick green elephant jumps over the lazy cat . The quick green elephant jumps over the lazy cat . The quick green elephant jumps over the lazy cat . The quick green elephant jumps over the lazy cat . The quick green elephant jumps over the lazy cat . 从文件读取编辑器命令 cat>script s/brown/green/ s/fox/elephant/ s/dog/cat/ sed -f script dog.txt The quick green elephant jumps over the lazy cat . The quick green elephant jumps over the lazy cat . The quick green elephant jumps over the lazy cat . The quick green elephant jumps over the lazy cat . The quick green elephant jumps over the lazy cat . cat>script2 {print $5 "'s userid is " $1 } 加入用户 useradd xuhui 改动password usermod -p xuhui xuhui 查看password文件 tail -l /etc/shadow cd - 返回上一个訪问的文件夹 查找文件命令 find [路径] [选项] [操作] find . -name 'test*' 查找 文件名为 test开头的 find . -mtime -90 -print 查找更改时间在90天内的文件 grep [选项] [模式] [文件] 在wodl.txt 找World单词 grep -w 'World' wodl.txt转载于:https://www.cnblogs.com/bhlsheji/p/5080382.html
