cut 选项 文件名
-f 列号 提取第几列
-d 分隔符 指定分隔符把行分成多列
不能以空格为分隔符。
[root@localhost ~]# cat testfile no. name sex score 1 zhangsan m 88 2 lisi f 89 3 wangwu m 87 [root@localhost ~]# cut -f 2 testfile 注释：默认分隔符是制表符 name zhangsan lisi wangwu [root@localhost ~]# cut -f 2,4 testfile name score zhangsan 88 lisi 89 wangwu 87
[root@localhost ~]# cat testfile no. na:me sex sco:re 1 zhang:san m 8:8 2 li:si f 8:9 3 wang:wu m 8:7 [root@localhost ~]# cut -f 1,3 -d : testfile no. na:re 1 zhang:8 2 li:9 3 wang:7
root@localhost ~]# cut -f 1 -d : /etc/passwd|grep xiong xiongjiawei [root@localhost ~]# grep xiong /etc/passwd|cut -d : -f 1 xiongjiawei [root@localhost ~]# grep xiong /etc/passwd|cut -d ":" -f 1 xiongjiawei [root@localhost ~]# grep xiong /etc/passwd|cut -f 1 -d : xiongjiawei [root@localhost ~]# grep xiong /etc/passwd|cut -f 1 -d ":" xiongjiawei
printf '格式' 输出内容
%ns 输出n个字符串
%ni 输出n个数字
%n.mf 输出共n位数字，m位小数，如%5.2f表示共3位整数，2位小数
a 警告声
Backspace键
f 清屏
换行，常用
Enter，常用
Tab，常用
v 垂直Tab
awk支持printf和print(linux默认无此命令)，print输出会自动加换行，printf是标准格式输出命令，不会自动加换行，如果要换行需要手动加。
[root@localhost ~]# printf %s a b cd ef g 1 2 abcdefg12[root@localhost ~]# printf %s %s a b cd ef g 1 2 %sabcdefg12[root@localhost ~]# printf '%s %s' a b cd ef g 1 2 a bcd efg 12 [root@localhost ~]# printf '%s %s' a b cd ef g 1 2 a bcd efg 12 [root@localhost ~]# printf '%s %s ' a b cd ef g 1 2 a b cd ef g 1 2 [root@localhost ~]# printf %s $(cat testfile) no.na:mesexsco:re1zhang:sanm8:82li:sif8:93wang:wum8:7[root@localhost ~]# [root@localhost ~]# cat testfile no. na:me sex sco:re 1 zhang:san m 8:8 2 li:si f 8:9 3 wang:wu m 8:7
awk '条件1{动作1} 条件2{运行2}...' 文件名
默认以空格为分隔符，执行命令时首先读取文件一行。
[root@localhost ~]# cat testfile no. name sex score age comment 1 zhansan m 88 18 student 2 li:si f 89 20 member 3 wangwu m 87 22 teacher [root@localhost ~]# awk {printf $2 $4} testfile awk: cmd. line:1: {printf awk: cmd. line:1: ^ unexpected newline or end of string 注释：报错的原因是awk命令后的条件动作未加单引号 [root@localhost ~]# awk '{printf $2 $4}' testfile namescorezhansan88li:si89wangwu87[root@localhost ~]# awk '{printf $2 $4 }' testfile awk: cmd. line:1: {printf $2 $4 } awk: cmd. line:1: ^ backslash not last character on line awk: cmd. line:1: {printf $2 $4 } awk: cmd. line:1: ^ syntax error 注释：报错是因为制表符 未加双引号 [root@localhost ~]# awk '{printf $2 " " $4 }' testfile awk: cmd. line:1: {printf $2 " " $4 } awk: cmd. line:1: ^ backslash not last character on line awk: cmd. line:1: {printf $2 " " $4 } awk: cmd. line:1: ^ syntax error 注释：报错是因为换行符 未加双引号 [root@localhost ~]# awk '{printf $2 " " $4 " "}' testfile name score zhansan 88 li:si 89 wangwu 87 [root@localhost ~]# awk '{printf $2" "$4" "}' testfile name score zhansan 88 li:si 89 wangwu 87 [root@localhost ~]# df -h|awk '{printf $1}' 文件系统/dev/sda5devtmpfstmpfstmpfstmpfs/dev/sda2/dev/sdb5/dev/sdb1/dev/sda1tmpfs[root@localhost ~]# df -h|awk '{printf $1" "}' 文件系统 /dev/sda5 devtmpfs tmpfs tmpfs tmpfs /dev/sda2 /dev/sdb5 /dev/sdb1 /dev/sda1 tmpfs [root@localhost ~]# df -h|awk '{print $1}' 文件系统 /dev/sda5 devtmpfs tmpfs tmpfs tmpfs /dev/sda2 /dev/sdb5 /dev/sdb1 /dev/sda1 tmpfs [root@localhost ~]# df 文件系统 1K-块 已用 可用 已用% 挂载点 /dev/sda5 16558080 1443112 15114968 9% / devtmpfs 490168 0 490168 0% /dev tmpfs 499968 0 499968 0% /dev/shm tmpfs 499968 6872 493096 2% /run tmpfs 499968 0 499968 0% /sys/fs/cgroup /dev/sda2 2086912 33160 2053752 2% /home /dev/sdb5 1998672 6144 1871288 1% /disk5 /dev/sdb1 999320 2564 927944 1% /disk1 /dev/sda1 201380 116576 84804 58% /boot tmpfs 99996 0 99996 0% /run/user/0 [root@localhost ~]# df -h|grep sda5 /dev/sda5 16G 1.4G 15G 9% / [root@localhost ~]# df -h|grep sda5|awk '{print $5}' 9% [root@localhost ~]# df -h|grep sda5|awk '{print $5}'|cut -d % -f1 注释：cut命令的-f选项后的列序号和f之间可以无空格 9 [root@localhost ~]# df -h|grep sda5|awk '{print $5}'|cut -d % -f 1 9 [root@localhost ~]# df -h|grep sda5|awk 'BEGIN{print "This is a title:"}{print $5}'|cut -d % -f 1 This is a title: 9 [root@localhost ~]# df -h|grep sda5|awk '{print "This is a title:"}{print $5}'|cut -d % -f1 This is a title: 9 [root@localhost ~]# awk '{print $1}' /etc/passwd 注释：awk的默认分隔符是空格 root:x:0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin adm:x:3:4:adm:/var/adm:/sbin/nologin lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt mail:x:8:12:mail:/var/spool/mail:/sbin/nologin operator:x:11:0:operator:/root:/sbin/nologin games:x:12:100:games:/usr/games:/sbin/nologin ftp:x:14:50:FTP nobody:x:99:99:Nobody:/:/sbin/nologin systemd-bus-proxy:x:999:997:systemd systemd-network:x:192:192:systemd dbus:x:81:81:System polkitd:x:998:996:User libstoragemgmt:x:997:995:daemon abrt:x:173:173::/etc/abrt:/sbin/nologin rpc:x:32:32:Rpcbind tss:x:59:59:Account postfix:x:89:89::/var/spool/postfix:/sbin/nologin sshd:x:74:74:Privilege-separated ntp:x:38:38::/etc/ntp:/sbin/nologin chrony:x:996:994::/var/lib/chrony:/sbin/nologin tcpdump:x:72:72::/:/sbin/nologin xiongjiawei:x:1000:1000:xiongjiawei:/home/xiongjiawei:/bin/bash qiaofeng:x:1001:1001::/home/qiaofeng:/bin/bash yangguo:x:1002:1002::/home/yangguo:/bin/bash st:x:1003:1004::/home/st:/bin/bash user1:x:1004:1005::/home/user1:/bin/bash [root@localhost ~]# awk '{FS=":"}{print $1}' /etc/passwd root:x:0:0:root:/root:/bin/bash 注释：设置分隔符为冒号:后第一行并未处理，因为awk命令的执行是首先读取第一行 bin daemon adm lp sync shutdown halt mail operator games ftp nobody systemd-bus-proxy systemd-network dbus polkitd libstoragemgmt abrt rpc tss postfix sshd ntp chrony tcpdump xiongjiawei qiaofeng yangguo st user1 [root@localhost ~]# awk 'BEGIN{FS=":"}{print $1}' /etc/passwd 注释：加BEGIN后就不会首先读取第一行，而是首先设置分隔符 root bin daemon adm lp sync shutdown halt mail operator games ftp nobody systemd-bus-proxy systemd-network dbus polkitd libstoragemgmt abrt rpc tss postfix sshd ntp chrony tcpdump xiongjiawei qiaofeng yangguo st user1 [root@localhost ~]# awk 'END{print "The end!"}BEGIN{FS=":"}{print $1}' /etc/passwd 注释：有BEGIN就有END，在命令动作中的顺序无所谓 root bin daemon adm lp sync shutdown halt mail operator games ftp nobody systemd-bus-proxy systemd-network dbus polkitd libstoragemgmt abrt rpc tss postfix sshd ntp chrony tcpdump xiongjiawei qiaofeng yangguo st user1 The end! [root@localhost ~]# cat testfile no. name sex score age comment 1 zhansan m 88 18 student 2 li:si f 89 20 member 3 wangwu m 87 22 teacher [root@localhost ~]# awk '$4>88{print $2}' testfile 注释：根据条件执行动作 name li:si
sed
sed [选项] '[动作]' 文件名
选项：
-n 只输出sed处理过的行
-i 修改原文件
-e 执行多条sed动作
动作：
p 打印，例2p打印第2行，2,3p打印第2、3行
d 删除，例‘3,4d'，不输出第3、4行
a 追加，例'2a Welcome to China'，在第2行后换行追加Welcom to China
i 插入，例'2i Welcom to China'，在第2行前插入Welcom to China，即在第1行后换行插入Welcom to China
c 行替换
s 字符串替换
[root@localhost ~]# cat testfile no. name sex score age comment 1 zhansan m 88 18 student 2 li:si f 89 20 member 3 wangwu m 87 22 teacher [root@localhost ~]# sed '2p' testfile 注释：不加选项-n时即输出原文件又输出经过处理的结果 no. name sex score age comment 1 zhansan m 88 18 student 1 zhansan m 88 18 student 2 li:si f 89 20 member 3 wangwu m 87 22 teacher [root@localhost ~]# sed -n '2p' testfile 1 zhansan m 88 18 student [root@localhost ~]# sed -n '2,3p' testfile 1 zhansan m 88 18 student 2 li:si f 89 20 member [root@localhost ~]# df -h|sed -n '2p' /dev/sda5 16G 1.4G 15G 9% / [root@localhost ~]# sed '3,4d' testfile no. name sex score age comment 1 zhansan m 88 18 student [root@localhost ~]# df -h|sed '2a This is added words' 文件系统 容量 已用 可用 已用% 挂载点 /dev/sda5 16G 1.4G 15G 9% / This is added words devtmpfs 479M 0 479M 0% /dev tmpfs 489M 0 489M 0% /dev/shm tmpfs 489M 6.8M 482M 2% /run tmpfs 489M 0 489M 0% /sys/fs/cgroup /dev/sda2 2.0G 33M 2.0G 2% /home /dev/sdb5 2.0G 6.0M 1.8G 1% /disk5 /dev/sdb1 976M 2.6M 907M 1% /disk1 /dev/sda1 197M 114M 83M 58% /boot tmpfs 98M 0 98M 0% /run/user/0 [root@localhost ~]# df -h|sed '2i This is added words' 文件系统 容量 已用 可用 已用% 挂载点 This is added words /dev/sda5 16G 1.4G 15G 9% / devtmpfs 479M 0 479M 0% /dev tmpfs 489M 0 489M 0% /dev/shm tmpfs 489M 6.8M 482M 2% /run tmpfs 489M 0 489M 0% /sys/fs/cgroup /dev/sda2 2.0G 33M 2.0G 2% /home /dev/sdb5 2.0G 6.0M 1.8G 1% /disk5 /dev/sdb1 976M 2.6M 907M 1% /disk1 /dev/sda1 197M 114M 83M 58% /boot tmpfs 98M 0 98M 0% /run/user/0 [root@localhost ~]# df -h|sed '2i This is added words' 文件系统 容量 已用 可用 已用% 挂载点 This is dded words /dev/sda5 16G 1.4G 15G 9% / devtmpfs 479M 0 479M 0% /dev tmpfs 489M 0 489M 0% /dev/shm tmpfs 489M 6.8M 482M 2% /run tmpfs 489M 0 489M 0% /sys/fs/cgroup /dev/sda2 2.0G 33M 2.0G 2% /home /dev/sdb5 2.0G 6.0M 1.8G 1% /disk5 /dev/sdb1 976M 2.6M 907M 1% /disk1 /dev/sda1 197M 114M 83M 58% /boot tmpfs 98M 0 98M 0% /run/user/0 [root@localhost ~]# df -h|sed '2i This is > added words' 文件系统 容量 已用 可用 已用% 挂载点 This is added words /dev/sda5 16G 1.4G 15G 9% / devtmpfs 479M 0 479M 0% /dev tmpfs 489M 0 489M 0% /dev/shm tmpfs 489M 6.8M 482M 2% /run tmpfs 489M 0 489M 0% /sys/fs/cgroup /dev/sda2 2.0G 33M 2.0G 2% /home /dev/sdb5 2.0G 6.0M 1.8G 1% /disk5 /dev/sdb1 976M 2.6M 907M 1% /disk1 /dev/sda1 197M 114M 83M 58% /boot tmpfs 98M 0 98M 0% /run/user/0 [root@localhost ~]# sed '2c deleted...' testfile no. name sex score age comment deleted... 2 li:si f 89 20 member 3 wangwu m 87 22 teacher [root@localhost ~]# sed '2c deleted... > new lines!!!' testfile no. name sex score age comment deleted... new lines!!! 2 li:si f 89 20 member 3 wangwu m 87 22 teacher [root@localhost ~]# cat testfile no. name sex score age comment 1 zhansan m 88 18 student 2 li:si f 89 20 member 3 wangwu m 87 22 teacher [root@localhost ~]# sed '3s/li:si/lisi/g' testfile 注释：2表示行序号，不加数字表示替换整个文档 no. name sex score age comment 1 zhansan m 88 18 student 2 lisi f 89 20 member 3 wangwu m 87 22 teacher [root@localhost ~]# cat testfile no. name sex score age comment 1 zhansan m 88 18 student 2 li:si f 89 20 member 3 wangwu m 87 22 teacher [root@localhost ~]# sed -i '3s/li:si/lisi/g' testfile 注释：-i选项表示修改原文件，此选项有一定风险性，慎用，如果需要修改文件内容建议使用vim [root@localhost ~]# cat testfile no. name sex score age comment 1 zhansan m 88 18 student 2 lisi f 89 20 member 3 wangwu m 87 22 teacher [root@localhost ~]# sed -e '2s/zhansan/sanzhan/g;3s/li/Li/g' testfile no. name sex score age comment 1 sanzhan m 88 18 student 2 Lisi f 89 20 member 3 wangwu m 87 22 teacher