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Homework and Emergencies Homework & Coursework Questions Question writing a shell script Post 302511094 by qbnlnk on Tuesday 5th of April 2011 09:04:44 PM
Old 04-05-2011
Question writing a shell script

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1. The problem statement, all variables and given/known data:
Write a shell script that allows the user to run the following commands:

  • ps
  • top
  • cmp
  • netstat
Once the user has selected the command, the program should ask the user what options they wish to use with the command (file paths, etc) and pass the command to the appropriate utility program displaying the information to the screen. At the end of the execution of the command, and whatever output is given, the system should pause (the user should be able to see the results) - and then ask the user if they want to continue. If so redisplay the menu, if not end the script.


2. Relevant commands, code, scripts, algorithms:
ps, top, cmp, netstat


3. The attempts at a solution (include all code and scripts):

no clue

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):

Florida International University, Miami, USA, Professor Meyer, COP3348.

OK, so I am taking an intro Linux course and I am very new to linux. I have been having a tough time when it comes to shell scripting. I know the basic commands and how to create the file and also how to open vi to edit the file. But when it comes to starting the code I just dont know where or how to start. Ive contacted my professor and he suggested I get help through forums so here goes. Im not asking for anyone to do the HW for me I just was hoping someone could help me get a good start and explain it to me. Please, anything helps right now...
 

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SCRIPT(1)							   User Commands							 SCRIPT(1)

NAME
script - make typescript of terminal session SYNOPSIS
script [options] [file] DESCRIPTION
script makes a typescript of everything displayed 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 the dialogue in this file. If no filename is given, the dialogue is saved in the file type- script. OPTIONS
-a, --append Append the output to file or to typescript, retaining the prior contents. -c, --command command Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e, --return Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f, --flush Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can supervise real-time what is being done using `cat foo'. --force Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic link. -q, --quiet Be quiet (do not write start and done messages to standard output). -t[file], --timing[=file] Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. -V, --version Display version information and exit. -h, --help Display help text and exit. NOTES
The script ends when the forked shell exits (a control-D for 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. script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. It is not recommended to run script in non-interactive shells. The inner shell of script is always interactive, and this could lead to unexpected results. If you use script in the shell initialization file, you have to avoid entering an infinite loop. You can use for example the .profile file, which is read by login shells only: if test -t 0 ; then script exit fi You should also avoid use of script in command pipes, as script can read more input than you would expect. 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), scriptreplay(1) HISTORY
The script command appeared in 3.0BSD. BUGS
script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. script is primarily designed for interactive terminal sessions. When stdin is not a terminal (for example: echo foo | script), then the session can hang, because the interactive shell within the script session misses EOF and script has no clue when to close the session. See the NOTES section for more information. AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux June 2014 SCRIPT(1)
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