head,tail,cat,more,less
head
- image.png
命令演示
[root@localhost mytest]# head -n 12 passwd.test
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root:x:0:0:root:/root:/bin/bash
[root@localhost mytest]# head -12 passwd.test
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root:x:0:0:root:/root:/bin/bash
tail
- image.png
-
命令演示
[root@localhost mytest]# tail -n 3 passwd.test
ntp:x:38:38::/etc/ntp:/sbin/nologin
avahi:x:70:70:Avahi mDNS/DNS-SD Stack:/var/run/avahi-daemon:/sbin/nologin
tcpdump:x:72:72::/:/sbin/nologin
[root@localhost mytest]#
[root@localhost mytest]# tail -3 passwd.test
ntp:x:38:38::/etc/ntp:/sbin/nologin
avahi:x:70:70:Avahi mDNS/DNS-SD Stack:/var/run/avahi-daemon:/sbin/nologin
tcpdump:x:72:72::/:/sbin/nologin- 另开一ssh窗口，对passwd文件进行修改
[root@localhost mytest]# tty
/dev/pts/4
[root@localhost mytest]# echo 'linux centos fedora suse RHEL' >> passwd
[root@localhost mytest]# echo 'linux centos fedora suse RHEL' >> passwd
[root@localhost mytest]# echo 'linux centos fedora suse RHEL' >> passwd
[root@localhost mytest]# echo 'linux centos fedora suse RHEL' >> passwd
[root@localhost mytest]# echo 'linux centos fedora suse RHEL' >> passwd - 在第一个ssh窗口，执行查看命令 tail -f passwd，不会自动退出文件，可以看到文件内容在增加
[root@localhost mytest]# tail -f passwd
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linux centos fedora suse RHEL
linux centos fedora suse RHEL
linux centos fedora suse RHEL
linux centos fedora suse RHEL
linux centos fedora suse RHEL
- 另开一ssh窗口，对passwd文件进行修改
cat
- image.png
命令演示
[root@localhost mytest]# cat redhat-release
CentOS Linux release 7.3.1611 (Core)
[root@localhost mytest]# cat version
Linux version 3.10.0-514.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) ) #1 SMP Tue Nov 22 16:42:41 UTC 2016
[root@localhost mytest]# cat redhat-release version
CentOS Linux release 7.3.1611 (Core)
Linux version 3.10.0-514.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) ) #1 SMP Tue Nov 22 16:42:41 UTC 2016
[root@localhost mytest]# cat > newfile
my name is zhanmusi
see you next week
^C
[root@localhost mytest]#
[root@localhost mytest]# cat newfile
my name is zhanmusi
see you next week
[root@localhost mytest]# cat hebing
cat: hebing: 没有那个文件或目录
[root@localhost mytest]# cat redhat-release redhat-release newfile > hebing
[root@localhost mytest]# cat hebing
CentOS Linux release 7.3.1611 (Core)
CentOS Linux release 7.3.1611 (Core)
my name is zhanmusi
see you next week
[root@localhost mytest]# cat -n hebing
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4 CentOS Linux release 7.3.1611 (Core)
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10 CentOS Linux release 7.3.1611 (Core)
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13 my name is zhanmusi
14 see you next week
[root@localhost mytest]# cat -b hebing
1 CentOS Linux release 7.3.1611 (Core)
2 CentOS Linux release 7.3.1611 (Core)
3 my name is zhanmusi
4 see you next week
[root@localhost mytest]# cat -E hebing
$
$
$
CentOS Linux release 7.3.1611 (Core)$
$
$
$
$
$
CentOS Linux release 7.3.1611 (Core)$
$
$
my name is zhanmusi$
see you next week$
[root@localhost mytest]#
more
- image.png
- 命令演示
[root@localhost mytest]# more -15 fstab.test
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# /etc/fstab
# Created by anaconda on Tue May 30 06:31:44 2017
# Accessible filesystems, by reference, are maintained under '/dev/disk'
--More--(32%)
[root@localhost mytest]# more +5 fstab.test
5
# /etc/fstab
# Created by anaconda on Tue May 30 06:31:44 2017
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/cl-root / xfs defaults 0 0
UUID=8be7dbe5-dde6-40b0-8900-c30f1007287e /boot xfs defaul
ts 0 0
/dev/mapper/cl-swap swap swap defaults 0 0
[root@localhost mytest]# more -s fstab.test
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# /etc/fstab
# Created by anaconda on Tue May 30 06:31:44 2017
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
/dev/mapper/cl-root / xfs defaults 0 0
UUID=8be7dbe5-dde6-40b0-8900-c30f1007287e /boot xfs defaul
ts 0 0
/dev/mapper/cl-swap swap swap defaults 0 0
[root@localhost mytest]# more +/2017 fstab.test
...跳过
# /etc/fstab
# Created by anaconda on Tue May 30 06:31:44 2017
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
/dev/mapper/cl-root / xfs defaults 0 0
UUID=8be7dbe5-dde6-40b0-8900-c30f1007287e /boot xfs defaul
ts 0 0
/dev/mapper/cl-swap swap swap defaults 0 0
[root@localhost mytest]# more +/4 fstab.test
...跳过
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# /etc/fstab
# Created by anaconda on Tue May 30 06:31:44 2017
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
/dev/mapper/cl-root / xfs defaults 0 0
UUID=8be7dbe5-dde6-40b0-8900-c30f1007287e /boot xfs defaul
ts 0 0
/dev/mapper/cl-swap swap swap defaults 0 0
[root@localhost mytest]# cat -n fstab.test | more
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11 #
12 # /etc/fstab
13 # Created by anaconda on Tue May 30 06:31:44 2017
14 #
15 # Accessible filesystems, by reference, are maintained under '/dev/disk'
16 # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
17 #
18 /dev/mapper/cl-root / xfs defaults 0 0
19 UUID=8be7dbe5-dde6-40b0-8900-c30f1007287e /boot xfs defaults 0 0
20 /dev/mapper/cl-swap swap swap defaults 0 0
less
- image.png
命令演示
由于more命令查看大文件后，屏幕占用效果不是很好，就不再展示详细执行过程。
