Shell命令_awk命令

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ID Name PHP Linux MySQL Average

1 Liming 82 95 86 87.66

2 Sc 74 96 87 85.66

3 Gao 99 83 93 91.66

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[[email protected] tmp]# cat score.txt

D Name PHP Linux MySQL Average

1 Liming 82 95 86 87.66

2 Sc 74 96 87 85.66

3 Gao 99 83 93 91.66

[[email protected] tmp]# awk ‘{printf $2 "\t" $6 "\n"}‘ score.txt 

Name    Average

Liming  87.66

Sc      85.66

Gao     91.66

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[[email protected] tmp]# df -h

Filesystem                 Size  Used Avail Use% Mounted on

/dev/mapper/vg_v2-lv_root   36G  5.0G   29G  15% /

tmpfs                      931M   72K  931M   1% /dev/shm

/dev/sda1                  485M   40M  421M   9% /boot

[[email protected] tmp]# df -h | awk ‘{print $1 "\t" $3}‘

Filesystem      Used

/dev/mapper/vg_v2-lv_root       5.0G

tmpfs   72K

/dev/sda1       40M

df -h|grep tmpfs|awk ‘{print $5}‘|cut -d "%" -f 1

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[[email protected] tmp]# awk ‘BEGIN{print "这里是开始前输出"}{printf $2 "\t" $6 "\n"}‘ score.txt

这里是开始前输出

Name    Average

Liming  87.66

Sc      85.66

Gao     91.66

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[[email protected] tmp]# awk ‘BEGIN{print "这里是开始前输出"}END{print "这里是结束输出"}{printf $2 "\t" $6 "\n"}‘ score.txt   

这里是开始前输出

Name    Average

Liming  87.66

Sc      85.66

Gao     91.66

这里是结束输出

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[[email protected] tmp]# cat /etc/passwd | grep "/bin/bash" | awk ‘BEGIN {FS=":"} {printf $1 "\t" $3 "\n"}‘

root    0

chenzhi 500

mysql   27

[[email protected] tmp]# cat /etc/passwd

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

uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin

operator:x:11:0:operator:/root:/sbin/nologin

games:x:12:100:games:/usr/games:/sbin/nologin

gopher:x:13:30:gopher:/var/gopher:/sbin/nologin

ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin

nobody:x:99:99:Nobody:/:/sbin/nologin

dbus:x:81:81:System message bus:/:/sbin/nologin

usbmuxd:x:113:113:usbmuxd user:/:/sbin/nologin

vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin

rpc:x:32:32:Rpcbind Daemon:/var/cache/rpcbind:/sbin/nologin

rtkit:x:499:497:RealtimeKit:/proc:/sbin/nologin

avahi-autoipd:x:170:170:Avahi IPv4LL Stack:/var/lib/avahi-autoipd:/sbin/nologin

abrt:x:173:173::/etc/abrt:/sbin/nologin

rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin

nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin

haldaemon:x:68:68:HAL daemon:/:/sbin/nologin

gdm:x:42:42::/var/lib/gdm:/sbin/nologin

ntp:x:38:38::/etc/ntp:/sbin/nologin

apache:x:48:48:Apache:/var/www:/sbin/nologin

saslauth:x:498:76:"Saslauthd user":/var/empty/saslauth:/sbin/nologin

postfix:x:89:89::/var/spool/postfix:/sbin/nologin

pulse:x:497:496:PulseAudio System Daemon:/var/run/pulse:/sbin/nologin

sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin

tcpdump:x:72:72::/:/sbin/nologin

chenzhi:x:500:500:chenzhi:/home/chenzhi:/bin/bash

mysql:x:27:27:MySQL Server:/var/lib/mysql:/bin/bash

[[email protected] tmp]# cat /etc/passwd | grep "/bin/bash" | awk ‘BEGIN {FS=":"} {printf $1 "\t" $3 "\n"}‘

root    0

chenzhi 500

mysql   27

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[[email protected] tmp]# cat score.txt

D Name PHP Linux MySQL Average

1 Liming 82 95 86 87.66

2 Sc 74 96 87 85.66

3 Gao 99 83 93 91.66

[[email protected] tmp]# cat score.txt | grep -v Name | awk ‘$6 >= 87 {printf $2 "\n" }‘

Liming

Gao