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Administracion de sistemas Linux/ Linux System by Tom Adelstein

By Tom Adelstein

De todos los sistemas Unix, Linux es una plataforma servidora excelente, un buen sistema de escritorio y el centro en torno al cual gira una gran parte de l. a. innovación del mundo informático genuine. Linux es probablemente el que más ámbitos abarca de todos los sistemas operativos, desde sistemas pequeños como un teléfono mó

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M. on a specific day. We can use the at command in such a situation. Sometimes we need to repeat the same task at a specific time, periodically, every day, or every month. In such situations, we can use the crontab command. Let's learn more about the utility of the at command. To use the at command, the syntax is as follows: $ at time date The following are the examples of the at command: • The Control + D command will save the at job. M. : $ at 11 am may 20 • All the jobs which are scheduled by the at command can be listed using the following command: $ atq • To remove a specific job listed by the atq command, we can use the following command: $ atrm job-id Understanding "crontab" If we need to run a specific task repetitively, then the solution is to use crontab.

Some examples are as follows: °° Regular file (-) °° Directory (d) °° Soft link (l) °° Character device driver (c) °° Block device driver (b) °° Pipe file (p) °° Socket file (s) • We can get information about a file using the following command: $ file fil_name // show type of file • Printing some text on the screen for showing results to the user or to ask details is an essential activity. °° The following command will create a new file called file_name using the cat command: $ cat > file_name line 1 line 2 line 3 < Cntrl + D will save the file > But this is very rarely used, as many powerful editors are already existing, such as vi or gedit.

Other user can only read but not edit or modify the files if the sticky bit is set. $ chmod +t filename Alternatively, you can use the following command: $ chmod 1777 File permissions after any of the preceding two commands will be drwxrwxrwt. [ 15 ] Getting Started and Working with Shell Scripting Summary In this chapter, you learned different ways to write and run Shell scripts. You also learned ways to handle files and directories as well as work with permissions. In the next chapter, you will learn about process management, job control, and automation.

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