Sponsored Content
Homework and Emergencies Homework & Coursework Questions New user needs help with bourne shell script Post 302939060 by Don Cragun on Sunday 22nd of March 2015 02:12:33 AM
Old 03-22-2015
Please use CODE tags when displaying sample input, output, and code.

You should look at the man page for your shell (presumably man sh for the Bourne shell). Look for the words "Background" and "background" in that man page for ways to run a process in the background and restrictions on what a background job can do. You don't seem to have anything in your script to run any processes in the background.

Also look for "Redirection" and "redirection" to see what > file does when it is used as a complete command, and what it does when it is used as part of a larger command.

And look for "Pipeline" and "pipeline". Having two processes in a pipeline that redirect standard output to the same file creates a race condition that may make it impossible to determine which process writing to that file will actually store lasting data in that file.

Then take a look at the man page for the cat utility. The command:
Code:
cat > file

doesn't necessarily create an empty file named file; it depends entirely on what cat reads from its standard input.

Is your understanding of part "a)" of your assignment that the output should include all of your files (including hidden files); or that the output should only include your hidden files?
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Bourne shell script need help please ?

i have this assignment.. and i mad this script but there is something wrong with it.. if anyone can tell me.. watz going on... i would appreciate it.. tHnX in advance.. count=1 val=$2 op=$1 ans=0 if then if then while do ... (7 Replies)
Discussion started by: dezithug
7 Replies

2. Shell Programming and Scripting

bourne shell script

Hi all, Can somebody answer the following query Thanks, Srinivas A shell program that takes one or any number of file directory names as input; sorts the directories given as parameters jointly in the ascending or decending order of choice For EX : dips abc etc desc will sort the files... (2 Replies)
Discussion started by: psrinivas
2 Replies

3. UNIX for Dummies Questions & Answers

Bourne Shell Script

Hello, I'm throwing this out there as a novice to the Unix world...I've been working on a project that requires me to ouput (using the echo command) a list of names in a single column format, but the problem is the input is in row format followed by a blank space...If anyone could give me a... (2 Replies)
Discussion started by: dmhonor914
2 Replies

4. Shell Programming and Scripting

Trouble using substr function with Bourne shell script

Hi, I'm a newbie to UNIX scripting and I'm having some trouble compiling my script. I'm using the Bourne Shell and cannot seem to use the substr function correctly. I'm trying to extract the last two digits of a year that's stored in a variable based off of a condition. I've searched the... (4 Replies)
Discussion started by: E2004
4 Replies

5. Shell Programming and Scripting

cd from a Bourne Shell Script - Please Help

Dear Bourne Shell Expert, I am trying to change the current working directory from within a Bourne Shell script. Simply enough i thought ! As I am sure you are well aware, Inside the script i echo `pwd` and it seems ok, but the shell spawns another shell to execute this and as such, when my... (10 Replies)
Discussion started by: fawqati
10 Replies

6. Shell Programming and Scripting

Bourne: How to invoke an alias from within a shell script

Bourne: How to invoke an alias from within a shell script If I type in the alias in the command line, it runs If I insert that same alias into my shell script and run the shell script, the alias is not invoked. Help please. (2 Replies)
Discussion started by: techshots
2 Replies

7. Shell Programming and Scripting

Accepting user input in Bourne shell and using sed

He guys. Basically I want to make a script that can add, delete and view stuff in a external file called config.txt. I can open it up in Joe but im not sure how to read in the user input or using commands automatically in joe to edit, save then quit. Problem area below: 1) echo "Add... (1 Reply)
Discussion started by: Pits
1 Replies

8. Shell Programming and Scripting

Bourne script: Check for root and oracle user

I have 2 separate Bourne shell scripts with 2 questions in Sun O/S & UNIX environment. Question 1: One of the scripts is supposed to be executed by "root" user only but cannot be executed after user executes "su - oracle". How can I check in the script whether the current user is "root" user?... (8 Replies)
Discussion started by: totziens
8 Replies

9. Shell Programming and Scripting

help with bourne shell script

Attempting to write a script to eventually notify me via email for when there is packetloss across the backbone. I am looking for values greater than 0% in the mtr field. #!/bin/sh target=www.google.com date +"%D"_"%T" >> /home/rich/mtr.log echo "----------------------------------------" >>... (1 Reply)
Discussion started by: closedown
1 Replies

10. Shell Programming and Scripting

Open a file from within a Bourne shell Script

I am suppose to make a program that cuts the extension off of a file. It uses that .ext to decide which program needs to be used to open the file. This only finds the name of the program from a list of programs I made. My problem is when it has the name of the program it needs to use, how can I... (3 Replies)
Discussion started by: dordrix
3 Replies
script(1)							   User Commands							 script(1)

NAME
script - make record of a terminal session SYNOPSIS
script [-a] [filename] DESCRIPTION
The script utility makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the record is saved in the file typescript. See WARNINGS. The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends when the forked shell exits or when Control-d is typed. OPTIONS
The following option is supported: -a Appends the session record to filename, rather than overwriting it. NOTES
script places everything that appears on the screen in filename, including prompts. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) WARNINGS
script can pose a security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a privileged user, that is, root. Be sure that typescript is not a link before running script. SunOS 5.10 30 Jan 2004 script(1)
All times are GMT -4. The time now is 09:05 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy