Sponsored Content
Top Forums Shell Programming and Scripting I need to understand the differences between the bash shell and the Bourne shell Post 302368269 by pludi on Wednesday 4th of November 2009 12:33:10 PM
Old 11-04-2009
The line
Code:
#!/bin/bash

is the so-called "shebang" line which tells the system what interpreter to run the script in. It's pretty much the same as the magic bytes in executable formats, like ".ELF" (UNIX) or "MZ" (Windows .exe). This was needed after other shells and interpreters came available other than just the Bourne Shell.

Your other errors probably stem from the sed commands, as probably starting with Korn Shell (which is the base for the POSIX standard shell) the commands for sed have to be passed as a single argument, but the shell splits arguments on spaces. So your first command should (as an example) be written as
Code:
sed -e 's/ -/ DOT./' ipc > raw

 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Bourne-again shell

Hi guys !! well i'm still new in learning UNIX , and actually i'm still studying it by myself .. anyway, some people told me the Bourne-again shell is a good version of UNIX to work on , and i tried to download yesterday but i didn't know how to start it ...... the ReadMe file associated with... (3 Replies)
Discussion started by: mrsamer
3 Replies

2. UNIX for Dummies Questions & Answers

bourne shell or korn shell?

Hi, I have a script that uses "nohup" command to execute a korn shell script. Which one is the correct shell to use bourne shell or korn shell to execute a korn shell? and why? Thanks in advanced. (2 Replies)
Discussion started by: XZOR
2 Replies

3. Shell Programming and Scripting

C shell & Bourne Shell

Hi Guys, My first post and simple one at that .. Really rusty with this shell scripting..\ I have a script called .. j.sh I am calling > j.sh LOG_PATH $BLMBRGDATA/blmbrg.properties where j.sh is grep $1 $2 | cut -d',' -f2 . $BLMBRGDATA is set to a directory path. why do i get :- $... (3 Replies)
Discussion started by: jsm66
3 Replies

4. Shell Programming and Scripting

bash shell: 'exec', 'eval', 'source' - looking for help to understand

Hi, experts. Whould anybody clear explay me difference and usage of these 3 commands (particulary in bash) : exec eval source I've tryed to read the manual pages but did not get much. Also could not get something useful from Google search - just so much and so not exactly, that is... (3 Replies)
Discussion started by: alex_5161
3 Replies

5. Shell Programming and Scripting

How to activate Korn Shell functionnalities in Bourne Shell

Hi All I have writing a Korn Shell script to execute it on many of our servers. But some servers don't have Korn Shell installed, they use Borne Shell. Some operations like calculation don't work : cat ${file1} | tail -$((${num1}-${num2})) > ${file2} Is it possible to activate Korn Shell... (3 Replies)
Discussion started by: madmat
3 Replies

6. Shell Programming and Scripting

Bourne/C shell help

Exercise Five Write a Bourne shell script which: • Professionalism: plan for this from the start. • Has one command line argument. • If the command line argument is a directory then the script should output the number of files in the directory. • If the command line argument is an ordinary... (2 Replies)
Discussion started by: moesom
2 Replies

7. Shell Programming and Scripting

Bourne shell & Korn shell

Could some one tell me the difference btw Bourne shell and the Kshell? Which is more flexible and reliable in terms of portability and efficiency. When i type the following command .. $ echo $SHELL yields me /bin/sh Does this tells me that I am in Bourne shell. If yes, how can i get... (6 Replies)
Discussion started by: bobby1015
6 Replies

8. Shell Programming and Scripting

Confusion about FOR LOOP syntax between Bourne and BASH shell. Please see.

for (( i=1; i<=3; i++ )); do for (( j=1; j<=3; j++ )); do for (( k=1; k<=3; k++ )); do echo $i$j$k done done done Will the above code work on a BOURNE shell? As far as my understanding is, if I am writing the above code in a file..say lol.sh and then running it through the terminal using... (7 Replies)
Discussion started by: navienavnav
7 Replies

9. Cybersecurity

'Shell Shock' vulnerability in Bourne shell

A severe vulnerability was discovered in Bourne shell. Just google for: bash vulnerability ... for more details. (5 Replies)
Discussion started by: Cochise
5 Replies

10. Shell Programming and Scripting

How to understand special character for line reading in bash shell?

I am still learning shell scripting. Recently I see a function for read configuration. But some of special character make me confused. I checked online to find answer. It was not successful. I post the code here to consult with expert or guru to get better understanding on these special characters... (3 Replies)
Discussion started by: duke0001
3 Replies
APPLY(1)						    BSD General Commands Manual 						  APPLY(1)

NAME
apply -- apply a command to a set of arguments SYNOPSIS
apply [-a c] [-d] [-#] command argument ... DESCRIPTION
The apply utility runs the named command on each argument argument in turn. Character sequences of the form ``%d'' in command, where 'd' is a digit from 1 to 9, are replaced by the d'th following unused argument. In this case, the largest digit number of arguments are discarded for each execution of command. The options are as follows: -# Normally arguments are taken singly; the optional number -# specifies the number of arguments to be passed to command. If the number is zero, command is run, without arguments, once for each argument. If any sequences of ``%d'' occur in command, the -# option is ignored. -a c The use of the character '%' as a magic character may be changed with the -a option. -d Display the commands that would have been executed, but do not actually execute them. ENVIRONMENT
The following environment variable affects the execution of apply: SHELL Pathname of shell to use. If this variable is not defined, the Bourne shell is used. EXAMPLES
apply echo a* is similar to ls(1); apply -2 cmp a1 b1 a2 b2 a3 b3 compares the `a' files to the `b' files; apply -0 who 1 2 3 4 5 runs who(1) 5 times; and apply 'ln %1 /usr/joe' * links all files in the current directory to the directory /usr/joe. FILES
/bin/sh default shell AUTHORS
Rob Pike BUGS
Shell metacharacters in command may have bizarre effects; it is best to enclose complicated commands in single quotes (''). HISTORY
The apply command appeared in 4.2BSD. BSD
April 4, 1994 BSD
All times are GMT -4. The time now is 06:24 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy