字符截取：cut

[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\t
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