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Top Forums Shell Programming and Scripting Need assistance with a file issue and a terminal issue Post 302607899 by MrMagoo22 on Thursday 15th of March 2012 03:27:38 PM
Old 03-15-2012
Need assistance with a file issue and a terminal issue

Hello everyone, I'm in need of some assistance. I'm currently enrolled in an introductory UNIX shell programming course and, well halfway through the semester, we are receiving our first actual assignment. I've somewhat realized now that I've fallen behind, and I'm working to get caught up, but for now I really could use some clarification on the two different tasks I need to setup in csh.

First one I've got about halfway finished. The assignment is to write a csh script that takes in a file and a directory name as parameters, validates that both arguments exist, then reads in a list of file names located in the parameter file and creates backups of those files within the param directory. I've got the permissions down, and I think I can handle creating the backup files, but I can't figure out any good way to read the file names from within the param file. Any commands I should be aware of here?

Second, and I haven't quite gotten very far on this one just yet, I need to create a simple script program which displays a welcome message to the user that opens it, but is only accessible from a specific terminal. Accessing the script from a different terminal should cause the program to immediately exit. Seems simple enough, but I don't know how to access the terminal ID or find any way to identify it.

If anyone is feeling generous enough to offer some assistance/clarification, I would greatly appreciate some help here. I'm pretty well stuck.
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-k] [-q] [-t time] [file [command ...]] DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. If the argument command ... is given, script will run the specified command with an optional argument vector instead of an interactive shell. Options: -a Append the output to file or typescript, retaining the prior contents. -k Log keys sent to program as well as output. -q Run in quiet mode, omit the start and stop status messages. -t time Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The default interval is 30 seconds. The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism). HISTORY
The script command appeared in 3.0BSD. BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues. When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual echo logging. This does not work when in a raw mode where the program being run is doing manual echo. BSD
June 6, 1993 BSD
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