Tail Command--linux command application of large dictionary 729 commands interpretation

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Tail command

Use the tail command to view the end data of a file, showing the last 10 lines of the specified file to the standard output by default. If more than one file is specified, tail adds the corresponding file name as the header at the beginning of each output.

Command syntax:

tail [options] [file]

The meanings of the options in the command are as shown in the table.

table tail command options meaning

options
output last K OK, here K is a number, using -n +k from the k line output
-c <k>	output last K bytes, here K is a number, using -C +k from the k byte output
-F	Data appended after the instant output file changes

Example: View the 3 rows of data content at the end of a file/etc/passwd .

[Email protected] ~]# tail-n 3/etc/passwd

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

Example: The data content of the file/etc/passwd is displayed starting from line .

[Email protected] ~]# tail-n +20/etc/passwd

Rtkit:x:499:497:realtimekit:/proc:/sbin/nologin

Avahi-autoipd:x:170:170:avahi Ipv4llstack:/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 Nfsuser:/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: "Saslauthduser":/var/empty/saslauth:/sbin/nologin

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

Pulse:x:497:496:pulseaudio Systemdaemon:/var/run/pulse:/sbin/nologin

Sshd:x:74:74:privilege-separated Ssh:/var/empty/sshd:/sbin/nologin

Tcpdump:x:72:72::/:/sbin/nologin

Example: View The data content at the end of the file/etc/passwd.

[Email protected]~]# tail-c 100/etc/passwd

Sshd:x:74:74:privilege-separatedssh:/var/empty/sshd:/sbin/nologin

Tcpdump:x:72:72::/:/sbin/nologin

Example: displays the data contents of a file/etc/passwd starting with the first byte.

[Email protected] ~]# tail-c +900/etc/passwd

Ahi 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 Nfsuser:/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 Systemdaemon:/var/run/pulse:/sbin/nologin

Sshd:x:74:74:privilege-separated Ssh:/var/empty/sshd:/sbin/nologin

Tcpdump:x:72:72::/:/sbin/nologin

Example: Dynamically tracking The growth of file/var/log/messages.

[Email protected] ~]# tail-f/var/log/messages

The tail command checks to see if the file adds new content every second, and then appends it to the original output and displays it. If you want to terminate the output, press the [Ctrl + C] key to break the tail command

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Tail Command--linux command application of large dictionary 729 commands interpretation