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Jim,

Thanks for the reply. I did a poor job of describing what I was trying to do.

If a certain user is logged in...then I want to run a command. Otherwise, no command.

So I need a script that does the following:

If a certain user is logged in

Run `command`

Else

Echo “incorrect user”


This is my first stab...which doesn't work:

#!/bin/bash
...

Nevermind. Got it.

#!/usr/bin/perl
print "Enter 10 characters\n";
chomp ($foo=<STDIN>);
@arr=split //, $foo;
for($i=0;$i<5;$i++) {
print $arr[$i+5] . " " . $arr[$i] . "\n";
}

So I dug around and found some code similar to what I want, but not quite (similar in that it can break a string down by characters).

#!/usr/bin/perl
print "Enter 10 characters\n";
chomp...

The string is actually going to be coming from STDIN.

How can I use Perl to a take a string of 10 characters and print the last five characters of the string in columns 1-5 and the first five in columns 6-10?

Result:
0123456789

5 0
6 1
7 2
8 3...

Perfect, exactly what I needed. Great learning experience. Thank you.

Using STDIN, how can I use perl to take an input string, with all lower case letters in the first five characters, and convert them to uppercase...

then take all uppercase letters in the second...

Thank you sir. I ended up with:
awk '{gsub(/,/, "\t")gsub("\"","");print}NR==3{exit 0}' test

using your scripts as a basis for getting this figured out. Thank you so much.

Thank you Franklin, works perfectly. Some csv files have quotes around the fields (e.g. "one","two","three","four") - how can I use awk to remove these upon printing as tsv?

Secondary question...

any advice on how I could specify which columns to print, upon converting a csv to a tsv? Like if I only wanted the first three columns of the tab-separated value to print?

Oh, okay - got it!

sed "s/,/"$'\t'/g test

works like a charm!

Macintosh-2:$ sed --version
sed: illegal option -- -
usage: sed script [-Ealn] [-i extension] [file ...]
sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]


When...

Hmmm, I have the latest version of OS X Leopard and am using BASH...but I'm guessing that may have nothing to do with what sed version I'm running? (Sorry, quite new to this).

Thanks.

When I do: sed 's/,/\t/g' test
it doesn't go to tabbed. It just eliminates spaces...?

Anyone have a simple UNIX script to look at for doing this? I'm interested in how to convert from csv to tsv, and then back again, if I want to.

Thanks!

Thanks guys!!

Thank you - what should be in the file then?

How can I use sed to print rulers of x characters in length on my terminal?

For example, I want sed to print a 50-character rule.

sed '/[1-50]/ p' ??

Thanks!

Yes, total is calculated above outside of the END statement:
total = $3 + $4 + $5

($3-$5 being fields showing logins for each of three months)

I have a list of people in a usage log and need to print the names and phone numbers of people with over 500 logins. I'd also like to display these names alphabetically.

I have their total logins...

Perfect, thanks for the help guys! Works like a charm.

How do I deal with extracting a portion of a record when multiple field separators are involved.

Let's say I have:
Mike Harrington;(555) 555-5555:250:100:175
Christian Dobbins;(555)...

I have a comma-separated record and I'd like to use sed to pull the Nth record from it.

It seems like it'd need to be something like this: sed -n 's/'"\,$1\,"'/&/p'

Am I close?

Great explanation. It's much more clear now. I was just making things a bit too complicated. Thank you for the help.