Exploring Linux Commands: Queries & Interesting Finds

[heman]

i have some queries..i was trying to find out some commands in the manual..
like,,

--what command can be used for compressing files in Linux..

--how to check man page for /etc/passwd ?

--and i am not clear with this uid command?
why is the "set uid bit" set for "su" command?

--and in killing processes,why does killall -e doesn't work??

And please tell about interesting and hard to figure commands which you are familiar with..

 

[ComputerGeek]

1) gzip or bzip make sure to tar a group of files first.
2) man passwd
3)set uid bit means that one must authenticate as what ever user is designated in order to open what ever it is... it is set for su because that is the switch user command and you don't want some one running around being able to get into everyone elses account.. now do you? :-)

4) do you want to kill bash and all the services as well?

 

[ravenprp]

There are a few commands that can be used for compressing files in Linux, but one of the most commonly used is "gzip." This command is used to compress and decompress files in the gzip format. Another commonly used command is "tar," which is used to create and extract archives. For example, to compress a file using gzip, you can use the command "gzip [filename]." To extract a gzip file, you can use the command "gunzip [filename]." To compress multiple files into one archive using tar, you can use the command "tar -czvf [archive name] [files]."

To check the man page for /etc/passwd, you can use the command "man /etc/passwd." This will bring up the manual page for the passwd file, which contains information about user accounts and their settings.

The "uid" command is used to display the user ID of a specific user. The "set uid bit" is a special permission that can be set for a command, such as "su," which allows a user to temporarily switch to another user's account without needing their password. This is useful for system administrators who need to perform tasks as another user without having to log in and out.

As for the "killall -e" command not working, it could be due to a few reasons. One possibility is that you are not using the correct syntax. Another possibility is that the process you are trying to kill does not have the "e" (exact match) option available. It's always a good idea to double-check the syntax and read the manual page for the command to understand its functionality.

Some interesting and hard to figure out commands that I am familiar with include "sed" and "awk," which are powerful text manipulation tools, and "find," which is used to search for files based on various criteria such as name, size, and permissions. Another useful command is "ssh," which allows you to securely connect to a remote computer and execute commands on it. These are just a few examples, as there are countless commands in Linux that can be useful and interesting to explore. I recommend experimenting with different commands and reading their manual pages to learn more about their functionality.