Identify all of the Unix commands and utilities to which it refers. Look up each
ID: 3646602 • Letter: I
Question
Identify all of the Unix commands and utilities to which it refers.Look up each command or utility in the man pages.
Include a description and an example usage of each of the commands or utilities you have identified.
A Student calls the UNIX help desk with a question:
Student: What is the command that will tell me the revision code of program ?
UNIX help desk: Yes, that's correct.
Student: No, what is it ?
UNIX help desk: Yes.
Student: So, which is the one ?
UNIX help desk: No. 'which' is used to find the program.
Student: Stop this. Who are you ?
UNIX help desk: Use 'whoami' not 'whoryou'. You can also
'finger you' to get information about 'you'.
Student: All I want to know is what finds the revision code ?
UNIX help desk: Use 'what'.
Student: That's what I am trying to find out. Isn't that true ?
UNIX help desk: No. 'true' gives you 0.
Student: Which one ?
UNIX help desk: 'true' gives you 0. 'which programname'
Student: Let's get back to my problem. What program? How do I find it?
UNIX help desk: Type 'find / -name it -print' to find 'it'. Type
'what program' to get the revision code.
Student: I want to find the revision code.
UNIX help desk: You can't 'find revisioncode', you must use 'what program'.
Student: Which command will do what I need?
UNIX help desk: No. 'which command' will find 'command'.
Student: I think I understand. Let me write that.
UNIX help desk: You can 'write that' only if 'that' is a user on your system.
Student: Write what?
UNIX help desk: No. 'write that'. 'what program'.
Student: Cut that out!
UNIX help desk: Yes. those are valid files for 'cut'.
Don't forget the options.
Student: Do you always do this ?
UNIX help desk: 'du' will give you disk usage.
Student: HELP!
UNIX help desk: 'help' is only used for Source Code Control System (SCCS).
Student: You make me angry.
UNIX help desk: No, I don't 'make me' angry but I did 'make programname' when I was upset once.
Student: I don't want to make trouble, so no more.
UNIX help desk: No 'more'? 'which' will help you find 'more'. Every system has 'more'.
Student: Nice help! I'm confused more now!
UNIX help desk: Understand that since 'help' is such a small program, it is better not to 'nice help'. and 'more now' is not allowed but 'at now' is. Unless of course 'now' is a file name.
Student: This is almost as confusing as my PC.
UNIX help desk: I didn't know you needed help with 'pc'. Let me get you
to the Pascal compiler team.
Explanation / Answer
du filename --- shows the disk usage of the files and directories in filename (without argument the current directory is used). du -s gives only a total. cp filename1 filename2 --- copies a file rm filename --- removes a file. It is wise to use the option rm -i, which will ask you for confirmation before actually deleting anything. You can make this your default by making an alias in your .cshrc file. ff --- find files anywhere on the system. This can be extremely useful if you've forgotten in which directory you put a file, but do remember the name. In fact, if you use ff -p you don't even need the full name, just the beginning. This can also be useful for finding other things on the system, e.g. documentation. whoami --- returns your username. Sounds useless, but isn't. You may need to find out who it is who forgot to log out somewhere, and make sure *you* have logged out. finger & .plan files of course you can finger yourself, too. That can be useful e.g. as a quick check whether you got new mail. Try to create a useful .plan file soon. Look at other people's .plan files for ideas. The file needs to be readable for everyone in order to be visible through 'finger'. Do 'chmod a+r .plan' if necessary. You should realize that this information is accessible from anywhere in the world, not just to other people on turing.
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