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Reading content of a variable to create a new one?

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# 1  
Old 02-08-2010
Reading content of a variable to create a new one?
Hello.

I've written up a script, that populates a variable with a list of tapes returned from my library. For example:

701940L3,701941L3,701942L3,701943L3,701944L3,701945L3,701946L3,701947L3,701948L3

So now, the variable "TAPELIST" contains those numbers, delimited by commas. I'd like to now have 2 other variables. The first containing the first 5 entries (701940L3,701941L3,701942L3,701943L3,701944L3) and the second containing the next 5...

I would guess it would be something like NEWLIST=$TAPELIST with some awks or something of the sort? and OTHERLIST=$TAPELIST next 5 entries...

Thanks for the help.

Stephan
# 2  
Old 02-08-2010
Hi, give this a try:
Code:
TAPELIST=701940L3,701941L3,701942L3,701943L3,701944L3,701945L3,701946L3,701947L3,701948L3
LIST2=${TAPELIST#*,*,*,*,*,}
LIST1=${TAPELIST%,${LIST2}}

Code:
$ echo $LIST1
701940L3,701941L3,701942L3,701943L3,701944L3
$ echo $LIST2
701945L3,701946L3,701947L3,701948L3

# 3  
Old 02-08-2010
Code:
TAPELIST=701940L3,701941L3,701942L3,701943L3,701944L3,701945L3,701946L3,701947L3,701948L3
FirstFive=`expr $TAPELIST : '\(\([^,]*,\)\{4\}[^,]*\).*'`
SecondFive=`expr $TAPELIST : '.*,\(\([^,]*,\)\{4\}.*\)'`

# 4  
Old 02-08-2010
Quote:
Originally Posted by Stephan
with some awks
Code:
[house@leonov] INPUT="701940L3,701941L3,701942L3,701943L3,701944L3,701945L3,701946L3,701947L3,701948L3"; \
[............] LIST_1=$( echo $INPUT | awk -F ',' '{print $1, $2, $3 , $4, $5}' ); \
[............] LIST_2=$( echo $INPUT | awk -F ',' '{print $6, $7, $8 , $9, $10}' ); \
[............] echo "LIST_1=( $LIST_1), LIST_2=( $LIST_2 )"
LIST_1=( 701940L3 701941L3 701942L3 701943L3 701944L3), LIST_2=( 701945L3 701946L3 701947L3 701948L3  )

# 5  
Old 02-08-2010
Quote:
Originally Posted by Scrutinizer
Hi, give this a try:
Code:
TAPELIST=701940L3,701941L3,701942L3,701943L3,701944L3,701945L3,701946L3,701947L3,701948L3
LIST2=${TAPELIST#*,*,*,*,*,}
LIST1=${TAPELIST%,${LIST2}}

Code:
$ echo $LIST1
701940L3,701941L3,701942L3,701943L3,701944L3
$ echo $LIST2
701945L3,701946L3,701947L3,701948L3

Thanks Scrutinizer. Seems to work, but grabs the first five (LIST2) and LIST1 then lists the rest of the tapes? not necessarily the next five...Appreciate the post. Thanks.

I got this to work pretty good though. Increased it to 7 "tapes" though to be a bit safer in my queries...

---------- Post updated at 01:17 PM ---------- Previous update was at 01:13 PM ----------
Quote:
Originally Posted by anbu23
Code:
TAPELIST=701940L3,701941L3,701942L3,701943L3,701944L3,701945L3,701946L3,701947L3,701948L3
FirstFive=`expr $TAPELIST : '\(\([^,]*,\)\{4\}[^,]*\).*'`
SecondFive=`expr $TAPELIST : '.*,\(\([^,]*,\)\{4\}.*\)'`

Thanks for the response. Yours seems to grab the first five but the the last five and not the next five...This could work though this way (at least as to what i am trying to do...). How could the "SecondFive" be modified to grab the "next" five though?

Thanks.

---------- Post updated at 01:19 PM ---------- Previous update was at 01:17 PM ----------
Quote:
Originally Posted by dr.house
Code:
[house@leonov] INPUT="701940L3,701941L3,701942L3,701943L3,701944L3,701945L3,701946L3,701947L3,701948L3"; \
[............] LIST_1=$( echo $INPUT | awk -F ',' '{print $1, $2, $3 , $4, $5}' ); \
[............] LIST_2=$( echo $INPUT | awk -F ',' '{print $6, $7, $8 , $9, $10}' ); \
[............] echo "LIST_1=( $LIST_1), LIST_2=( $LIST_2 )"
LIST_1=( 701940L3 701941L3 701942L3 701943L3 701944L3), LIST_2=( 701945L3 701946L3 701947L3 701948L3  )

This obviously works just as expected and it is what i was trying to figure out...But i need the LIST_1 to return the comma in between the tape list...Kinda like "701940L3,701941L3,701942L3,701943L3,701944L3". No commas at the beginning of the list and none at the end...

Thansk.
Last edited by Stephan; 02-08-2010 at 02:41 PM..
# 6  
Old 02-08-2010
Can't you just use cut?

Code:
List_1=$(echo $TAPELIST | cut -d, -f1-5)
List_2=$(echo $TAPELIST | cut -d, -f6-10)

# 7  
Old 02-08-2010
Quote:
Originally Posted by steadyonabix
Can't you just use cut?

Code:
List_1=$(echo $TAPELIST | cut -d, -f1-5)
List_2=$(echo $TAPELIST | cut -d, -f6-10)

Looks like it is working like a charm! Thanks. Simple enough.Smilie
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