Re: OT: Linux Shell Script

You can always stop by UNIX.com Forums, people there are usually fast and
precise on their responses... look for the "Shell Programming and Scripting"
subforum, it is always very helpful.

On Wed, Apr 28, 2010 at 9:55 AM, Tyson Scott <tscott_at_ipexpert.com> wrote:

> Dan,
>
>
>
> Thanks for sharing. With this large of a group there always has to be
> someone that knows the bash shell better than myself. That is exactly what
> I was looking for. cat isn't necessary in this example. The whole task
> can
> be accomplished with sed.
>
>
>
> sed -e '/3/{
>
> N
>
> /3\n4/d
>
> }
>
> ' -i file.txt
>
>
>
> This way I can edit the file inline. Thanks again.
>
>
>
> Regards,
>
>
>
> Tyson Scott - CCIE #13513 R&S, Security, and SP
>
> Technical Instructor - IPexpert, Inc.
>
> Mailto: <mailto:tscott_at_ipexpert.com> tscott_at_ipexpert.com
>
> Telephone: +1.810.326.1444, ext. 208
>
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>
>
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>
> From: Dan Shechter [mailto:danshtr_at_gmail.com]
> Sent: Wednesday, April 28, 2010 1:20 AM
> To: Tyson Scott
> Cc: ccielab_at_groupstudy.com
> Subject: Re: OT: Linux Shell Script
>
>
>
> Hi Tyson,
>
> Try this:
>
> dans_at_dans-desktop:~/tmp/tyson$ cat a.txt | sed -e '/3/{
> N
> /3\n4/d
> }
> '
>
>
>
> HTH,
>
> Dan #13685 (RS/Sec/SP)
>
> Troubleshooting blog: <http://dans-net.com/> http://dans-net.com
>
>
>
>
>
>
>
>
> On Wed, Apr 28, 2010 at 7:19 AM, Tyson Scott <tscott_at_ipexpert.com> wrote:
>
> Hey guys,
>
>
>
> Ignore this if you are not familiar with Linux. I am throwing this out
> because I expected it to work and can't get it working.
>
>
>
> I am trying to create a bash script to delete two lines in a file only if
> they are directly connected to one another.
>
>
>
> For example if I had a file "file.txt" with the following lines
>
> 1
>
> 2
>
> 3
>
> 4
>
> 5
>
>
>
> And I wanted to delete the lines with 3 & 4 but only if they were together.
> i.e. I want to make sure I am not deleting if they are:
>
> 1
>
> 3
>
> 2
>
> 4
>
> 5
>
>
>
> I know I could do
>
> sed '/3/d' -i file.txt;sed '/4/d' -i file.txt
>
>
>
> but that doesn't make sure they are directly together
>
>
>
> I tried
>
>
>
> sed '/3$\r\n4/d' -i file.txt
>
>
>
> But it seems either it doesn't match or I am using the incorrect regular
> expression
>
>
>
> I know I could also do
>
>
>
> cat file.txt | grep -v 3 | grep -v 4 > file.txt
>
>
>
> but still not making sure it is one line. Any thoughts would be
> appreciated. I believe there should be a way to do this with sed but I
> wouldn't call myself a guru on the great intricacies of sed. If not then I
> will just use expect, but I wanted to keep it simplistic.
>
>
>
> I know with expect I can do
>
> expect -re "\n3\r\n4" { exec sed '/3/d' -i file.txt;sed '/4/d' -i file.txt
> }
>
>
>
> And that verifies the two lines are together and then I can delete the
> files
> based off of them being together but I was hoping to stick with a simple
> bash shell script for this task.
>
>
>
> Regards,
>
>
>
> Tyson Scott - CCIE #13513 R&S, Security, and SP
>
> Technical Instructor - IPexpert, Inc.
>
> Mailto: tscott_at_ipexpert.com
>
> Telephone: +1.810.326.1444, ext. 208
>
> Live Assistance, Please visit: www.ipexpert.com/chat
>
> eFax: +1.810.454.0130
>
>
>
> IPexpert is a premier provider of Self-Study Workbooks, Video on Demand,
> Audio Tools, Online Hardware Rental and Classroom Training for the Cisco
> CCIE (R&S, Voice, Security & Service Provider) certification(s) with
> training locations throughout the United States, Europe, South Asia and
> Australia. Be sure to visit our online communities at
> www.ipexpert.com/communities and our public website at www.ipexpert.com
> <http://www.ipexpert.com/>
>
>
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Received on Wed Apr 28 2010 - 10:00:30 ART