[SATLUG] I've newly moved to Ubuntu 11.10 and a few SED & bash questions

buddylee48 buddylee48 at gmail.com
Sat Dec 10 18:40:06 CST 2011

In a bash script you can simply end the line with "\" so for instance:

someVar="This is\

echo $someVar

Will output "This is someVar"

Good luck! Awk is fun too once you get done with sed and imho awk scripts
are much more readable.

On Dec 10, 2011 6:33 PM, "John-Eric" <johnericno at gmail.com> wrote:

> Two years ago when I had to reinstall Windows XP to fix an unstable OS, I
> swore never again. When XP crashed and wouldn't boot this week, I installed
> Ubuntu 11.10 on a 16GB flash drive. So far, I'm pretty happy. I will
> install to my Crucial M4 128GB SSD arrives on Tuesday. I started using
> computers in 1973, using a DEC PDP-10 with a paper tape reader. I was a
> pretty good at the command line and batch files in DOS, which I still use
> for quick & dirty tasks today. After staying up all night and lots of
> Googling & reading, I have a few questions about SED in a bash script.
> Since this file can sometimes get quite large, I would like to make a
> single pass through the file, reading each line only once. I have placed
> each substitution on a separate line for easier reading, but is there a way
> to span -e over several lines? I need to know if I've made any obvious
> noobie mistakes and if there are any improvements I can make.
> Thanks for your help,
> John-Eric
> ======== Begin thsed.sh
> #!/bin/bash
> # This script trims the subject line of Thunderbird folder files to make
> duplicates easier to find.
> # It would be ideal if this script only evaluated lines that start with
> "Subject:"
> # Syntax= sed -e 's/find1/sub1/' -e 's/find2/sub2/g' <old >new
> # Syntax= sed '/baz/s/foo/bar/g' #Replace "foo" with "bar" only on lines
> that begin with "Subject:"
> #
> # input1= Subject: [Group One] (OT) "This is the text." [Archivo Adjunto 1]
> # input2= Subject:    {Message: 1234) @##-Some Different Text##@ [Archivos
> Adjuntos 78]
> #
> sed -e '/^subject:/s/^subject: *[\[\{\(](.*?)[\)\}\]] */Subject: /g'
>  #Remove anything inside any mixed pair of [,{,( and ),},] if it follows
> "Subject:"
>      -e '/^subject:/s/ fsrv//g'    #Remove "fsrv" anywhere on the line
>      -e '/^subject:/s/ \[fsc\]//g'    #Remove "[fsc]" anywhere on the line
>      -e '/^subject:/s/ *\[Archivos? adjuntos? *\d+\] */g'    #Remove
> "[Archivo Adjunto 1]" and "[Archivos Adjuntos 78]" and surrounding
> whitespace anywhere on the line
>      -e '/^subject:/s/\(\s-\|[^A-Za-**z0-9-]\)/ /g'    #Allow only
> alphanumeric characters and spaces
>      -e '/^subject:/s/  +/ /g'    #Compress white space
> <'/media/RAID-S/Thunderbird/**Mail/Local Folders/InFile'
> >'/media/RAID-S/Thunderbird/**Mail/Local Folders/OutFile'
> ===== End thsed.sh
> --
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