5.11. 表格操作/行列转换

列格式化

下面举一个例子 ，mount 执行结果

[www@netkiller www.netkiller.cn]$ mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs (rw,nosuid,size=1931400k,nr_inodes=482850,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/xvda1 on / type ext4 (rw,relatime,nobarrier,data=ordered)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=33,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
mqueue on /dev/mqueue type mqueue (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
/dev/xvdb1 on /opt type btrfs (rw,relatime,ssd,space_cache)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,relatime)
none on /proc/xen type xenfs (rw,relatime)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=361892k,mode=700)
/dev/xvdb1 on /var/ftp type btrfs (rw,relatime,ssd,space_cache)
		

使用 column 格式化后

[www@netkiller www.netkiller.cn]$ mount | column -t 
sysfs        on  /sys                        type  sysfs        (rw,nosuid,nodev,noexec,relatime)
proc         on  /proc                       type  proc         (rw,nosuid,nodev,noexec,relatime)
devtmpfs     on  /dev                        type  devtmpfs     (rw,nosuid,size=1931400k,nr_inodes=482850,mode=755)
securityfs   on  /sys/kernel/security        type  securityfs   (rw,nosuid,nodev,noexec,relatime)
tmpfs        on  /dev/shm                    type  tmpfs        (rw,nosuid,nodev)
devpts       on  /dev/pts                    type  devpts       (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs        on  /run                        type  tmpfs        (rw,nosuid,nodev,mode=755)
tmpfs        on  /sys/fs/cgroup              type  tmpfs        (ro,nosuid,nodev,noexec,mode=755)
cgroup       on  /sys/fs/cgroup/systemd      type  cgroup       (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore       on  /sys/fs/pstore              type  pstore       (rw,nosuid,nodev,noexec,relatime)
cgroup       on  /sys/fs/cgroup/perf_event   type  cgroup       (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup       on  /sys/fs/cgroup/cpu,cpuacct  type  cgroup       (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup       on  /sys/fs/cgroup/devices      type  cgroup       (rw,nosuid,nodev,noexec,relatime,devices)
cgroup       on  /sys/fs/cgroup/net_cls      type  cgroup       (rw,nosuid,nodev,noexec,relatime,net_cls)
cgroup       on  /sys/fs/cgroup/blkio        type  cgroup       (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup       on  /sys/fs/cgroup/hugetlb      type  cgroup       (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup       on  /sys/fs/cgroup/freezer      type  cgroup       (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup       on  /sys/fs/cgroup/memory       type  cgroup       (rw,nosuid,nodev,noexec,relatime,memory)
cgroup       on  /sys/fs/cgroup/cpuset       type  cgroup       (rw,nosuid,nodev,noexec,relatime,cpuset)
configfs     on  /sys/kernel/config          type  configfs     (rw,relatime)
/dev/xvda1   on  /                           type  ext4         (rw,relatime,nobarrier,data=ordered)
systemd-1    on  /proc/sys/fs/binfmt_misc    type  autofs       (rw,relatime,fd=33,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
mqueue       on  /dev/mqueue                 type  mqueue       (rw,relatime)
debugfs      on  /sys/kernel/debug           type  debugfs      (rw,relatime)
hugetlbfs    on  /dev/hugepages              type  hugetlbfs    (rw,relatime)
/dev/xvdb1   on  /opt                        type  btrfs        (rw,relatime,ssd,space_cache)
binfmt_misc  on  /proc/sys/fs/binfmt_misc    type  binfmt_misc  (rw,relatime)
none         on  /proc/xen                   type  xenfs        (rw,relatime)
tmpfs        on  /run/user/0                 type  tmpfs        (rw,nosuid,nodev,relatime,size=361892k,mode=700)
/dev/xvdb1   on  /var/ftp                    type  btrfs        (rw,relatime,ssd,space_cache)

		

$ (printf "PERM LINKS OWNER GROUP SIZE MONTH DAY HH:MM/YEAR NAME\n" ; ls -l | sed 1d) | column -t

$ cat /etc/passwd |tr ':' ' ' | column -t

$ cat /etc/passwd |tr ':' ' ' | column -t | colrm  20 20
		

# vim test
aaaaa   bbbbb   ccccc   ddddd
1111    2222    3333    444

# paste -s test
aaaaa   bbbbb   ccccc   ddddd   1111    2222    3333    444
		

join 命令就是一个根据关键字合并数据文件的命令(join lines of two files on a common field),类似于数据库中两张表关联查询.

		


内连接（inner join）                            格式：join <FILE1> <FILE2>
左连接（left join, 左外连接, left outer join）   格式：join -a1 <FILE1> <FILE2>
右连接（right join, 右外连接,right outer join）  格式：join -a2 <FILE1> <FILE2>
全连接（full join, 全外连接, full outer join）   格式：join -a1 -a2 <FILE1> <FILE2>

// 注意 使用 join 来合并两个文件的数据行时, 这两个文件必须要被正确排序.

1) 差集
[root@test23 ~]# cat a.txt | sort > file1; cat b.txt | sort > file2; join  -v 1   file1 file2
1.1.1.1
3.3.3.3
[root@test23 ~]# cat a.txt | sort > file1; cat b.txt | sort > file2; join  -v 2   file1 file2
4.4.4.4
a.b.c.d

2) 并集
[root@test23 ~]# cat a.txt | sort > file1; cat b.txt | sort > file2; join  -a1 -a2   file1 file2
1.1.1.1
1.2.3.4
2.2.2.2
3.3.3.3
4.4.4.4
a.b.c.d

3) 交集
// 不指定任何参数的情况下使用join命令,相当于数据库中的内连接,(关键字,默认用第一列[使用空格作为分割符]作为关键字)不匹配的行不会输出.
[root@test23 ~]# cat a.txt | sort > file1; cat b.txt | sort > file2; join     file1 file2
1.2.3.4
2.2.2.2


join 其他用法

-t <CHAR> 指定分隔符,比如: -t ':' 使用冒号作为分隔符,默认的分隔符是空白.

-o <FILENO.FIELDNO> ... 指定输出字段 其中FILENO=1表示第一个文件,FILENO=2表示第二个文件,FIELDNO表示字段序号,从1开始编号.默认会全部输出,但关键字列只输出一次.