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Full Discussion: Bash Scripting - sed (substitue)
Homework and Emergencies Homework & Coursework Questions Bash Scripting - sed (substitue) Post 302523842 by syco__ on Friday 20th of May 2011 03:08:07 AM
Old 05-20-2011
Bash Scripting - sed (substitue)
1. The problem statement, all variables and given/known data:

I have been asked to create a bash script to delete comments from another file but in the file they have an echo command with this inside of it /* this is an echo */\ so obviously they want to keep this one in the file. I have found this bit of code and im having trouble reading it. starting with the first line with #!/bin/sed -f as we have only be dealing with #!/bin/bash. so therefor all the :x and N bs etc. is making it harder for me to understand so in other words i want to re-write this code starting with #!/bin/bash and using straight calls to the sed command. Any help would be great.

2. Relevant commands, code, scripts, algorithms:

Code:
#!/bin/sed -f

# Simple Sed Program to remove all comments from c program

/\/\*/!b

:x
/\*\//!{
N
bx
}
# delete /*...*/
s/\/\*.*\*\///

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

Code:
#!/bin/bash 
# Simple Sed Program to remove all comments from c program

/\/\*/!b

sed -x
/\*\//!{
sed -N
bx
}
s/\/\*.*\*\///

This is straight up not working.


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

 2309ENG: C & Unix Programming - Dr David Rowlands

Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).
 

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LEARN ABOUT CENTOS

bashbug

BASHBUG(1)						      General Commands Manual							BASHBUG(1)

NAME

       bashbug - report a bug in bash

SYNOPSIS

       bashbug [--version] [--help] [email-address]

DESCRIPTION

       bashbug	is  a shell script to help the user compose and mail bug reports concerning bash in a standard format.	bashbug invokes the editor
       specified by the environment variable EDITOR on a temporary copy of the bug report format outline. The user must fill  in  the  appropriate
       fields  and  exit  the  editor.	 bashbug  then	mails the completed report to bug-bash@gnu.org, or email-address.  If the report cannot be
       mailed, it is saved in the file dead.bashbug in the invoking user's home directory.

       The bug report format outline consists of several sections.  The first section provides information about the  machine,	operating  system,
       the  bash  version, and the compilation environment.  The second section should be filled in with a description of the bug.  The third sec-
       tion should be a description of how to reproduce the bug.  The optional fourth section is for a proposed fix.  Fixes are encouraged.

ENVIRONMENT

       bashbug will utilize the following environment variables if they exist:

       EDITOR Specifies the preferred editor. If EDITOR is not set, bashbug defaults to emacs.

       HOME   Directory in which the failed bug report is saved if the mail fails.

       TMPDIR Directory in which to create temporary files and directories.

SEE ALSO

       bash(1)

AUTHORS

       Brian Fox, Free Software Foundation
       bfox@gnu.org

       Chet Ramey, Case Western Reserve University
       chet@po.cwru.edu

GNU Bash-4.0							   1998 July 30 							BASHBUG(1)
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