博客介绍了Linux系统中使用head和tail命令查看文件内容的方法。包括显示文件前6行、后25行，结合使用显示指定范围行，以及使用tail -f实时跟踪文件更新，还可同时跟踪多个日志文件。
## (1) displays the first 6 lines of a file
head -6 readme.txt
## (2) displays the last 25 lines of a file
tail -25 mail.txt
#(3) Here's an example of using head and tail in concert to display the 11th through 20th line of a file.
head -20 file | tail -10
## (4) display ongoing updates to the given
## log file
tail -f /usr/tmp/logs/daemon_log.txt
Imagine that a daemon process was continually appending activity logs to the /usr/adm/logs/daemon_log.txt file. Using tail -f at a console window, for example, will more or less track all updates to the file in real time. (The -f option is applicable only when tail's input is a file).
If you give multiple arguments to tail, you can track several log files in the same window.
## track the mail log and the server error log
## at the same time.
tail -f /var/log/mail.log /var/log/apache/error_log
head -6 readme.txt
## (2) displays the last 25 lines of a file
tail -25 mail.txt
#(3) Here's an example of using head and tail in concert to display the 11th through 20th line of a file.
head -20 file | tail -10
## (4) display ongoing updates to the given
## log file
tail -f /usr/tmp/logs/daemon_log.txt
Imagine that a daemon process was continually appending activity logs to the /usr/adm/logs/daemon_log.txt file. Using tail -f at a console window, for example, will more or less track all updates to the file in real time. (The -f option is applicable only when tail's input is a file).
If you give multiple arguments to tail, you can track several log files in the same window.
## track the mail log and the server error log
## at the same time.
tail -f /var/log/mail.log /var/log/apache/error_log
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