Shell Programming and Scripting

Hey all,

This is my first post, and I am relatively new to linux/unix scripts. I am writing a bash script in which I am trying to extract one line from another file and parse specific words from the line into an array. So for example, I have a file called SortScans in which the first 5 lines might look like this (nevermind that this file is in csh):

Code:

 
#!/bin/csh

set Runs = (2 3 4 5 6 7 8 9 10 11 12 13)
set Folders = (anat RS1 RS2 RS3 DTI DTI DTI DTI DTI DTI DFM DFM)

and in my new script, I want to create 2 arrays that would correspond just to what's inside those parentheses, where the end result would be the following 2 arrays

RunsArray[*] = 2 3 4 5 6 7 8 9 10 11 12 13
FoldersArray[*] = anat RS1 RS2 RS3 DTI DTI DTI DTI DTI DTI DFM DFM

So here is the code that I am using so far in my script just to create RunsArray

Code:

 
#!/bin/bash

RUNS=`echo | awk 'NR==4 {print;exit}' SortScans`

sed -i 's/*(//' $RUNS
sed -i 's/)//' $RUNS

declare -a RunsArray
RunsArray=$RUNS

I don't really know what I'm doing there, I just sort of copy pasted different related things I've seen on forums. But I'm getting the following error on the sed part -

sed: can't read set: no such file or directory

and that error repeats for each word or number down the line (i.e. runs, =, (2, 3, 4, etc.)

Anybody think they can help me out? Like I said I'm just starting out, so if you think you have a better way of doing this altogether, I would love to hear it. Thanks y'all.

This should do it:

Code:

#!/bin/bash
RunsArray=( $(sed -n '/set Runs/{s/.*(//; s/)$//p}' SortScans) )
 
echo RunsArray elements: ${#RunsArray[@]}
echo Number 0: ${RunsArray[0]}
echo Number 1: ${RunsArray[1]}

Hi,

I don't know why, but my script doesn't print anything.

Code:

RunsArray = ( $(awk -F"(" '/set Runs/{sub(/\)/,"");print $2}' SortScans) )
FoldersArray = ( $(awk -F"(" '/set Folders/{sub(/\)/,"");print $2}' SortScans) )

echo  ${RunsArray[@]}
echo  ${FoldersArray[@]}

Maybe somebody could see what is wrong.

Thanks in advance

Regards

It's that spaces on either side of "="
Also you cat get rid of the sub() call my making field seperator "(" or ")"

Code:

RunsArray=( $(awk -F"[)(]" '/set Runs/{print $2}' SortScans) )
FoldersArray=( $(awk -F"[)(]" '/set Folders/{print $2}' SortScans) )
 
echo  ${RunsArray[@]}
echo  ${FoldersArray[@]}

Thanks very much, I will try that. But will this work without the final forward slash for the sed command - after the } and before the '? Could you explain why it isn't needed there?

First lets expand the sed command to make it more readable:

Code:

sed -n '
/set Runs/ {
    s/.*(//;
    s/)$//p
}' SortScans

This does don' t print any line by default (-n).
For any line that contains "set Runs":

Hey thanks, it works great for FoldersArray (creates an array of strings) but it doesn't work for RunsArray (which would be an array of numbers).

RunsArray just comes up as an empty array. Any ideas?