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Homework and Emergencies Homework & Coursework Questions New user needs help with bourne shell script Post 302939055 by luislozoya on Sunday 22nd of March 2015 12:24:56 AM
Old 03-22-2015
New user needs help with bourne shell script

This is my question, below the question is the template

Write and execute a Bourne shell script called homework that will

From within the script, create three background processes:
a) (2 points) one that saves a long listing of your hidden files to a file named hiddenlist
b) (2 points) one that saves a full listing of the status of your current running processes to a file named pstat
c) (2 points) one that stores only the count of the number of words from the file homework2 into a file named wordcount
d) (1 point) issue a command to wait for ALL three background processes to complete.
e) (1 point) give the user a message stating that the process are completed



1.There are no variables.

2. Relevant commands, code, script, alogrithems.
The relevant command would be cat to create files the | to join commands
for a I would need ls -la
for b I would need ps
for c I would need wc
for d I would need wait
for e I would need echo

3. Here is one of the many attempts I have made to solve this problem, I have many more but don't want
to flood the forum with my failed attempts.




Code:
cat > hiddenlist | ls -la > hiddenlist
cat > pstat | ps > pstat
cat > wordcount | wc homework2 > wordcount
wait

echo “Background Processes complete”


4. California State University Fullerton, Fullerton California USA Floyd Holiday CPSC253U

Last edited by Don Cragun; 03-22-2015 at 03:04 AM.. Reason: Add CODE and ICODE tags.
 

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

NAME
script -- make typescript of terminal session SYNOPSIS
script [-akq] [-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. The following options are available: -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
January 22, 2004 BSD
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