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  #1 (permalink)  
Old 03-23-2007
prkfriryce prkfriryce is offline
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Posts: 44
need for loop to include fields as one line
another question that could possibly be answered with awk...

Code:
#cat filename
ab   cd   ef:ghi:jk  lm:nop  qrs
ab   cd   ef:ghi:jk  lm:nop  qrs
ab   cd   ef:ghi:jk  lm:nop  qrs
ab   cd   ef:ghi:jk  lm:nop  qrs

# for x in `awk 'sub($1" +"$2" +","",$0) ' filename`; do echo $x; done
ef:ghi:jk  
lm:nop
qrs
ef:ghi:jk  
lm:nop
qrs
ef:ghi:jk  
lm:nop
qrs
ef:ghi:jk  
lm:nop
qrs
Is there awk syntax to include all fields on one line so the for loop reads 4 lines and not 12?

IE


Code:
# for x in `awk 'sub($1" +"$2" +","",$0) ' filename`; do echo $x; done
ef:ghi:jk  lm:nop  qrs
ef:ghi:jk  lm:nop  qrs
ef:ghi:jk  lm:nop  qrs
ef:ghi:jk  lm:nop  qrs
Last edited by prkfriryce; 03-23-2007 at 11:01 AM..
  #2 (permalink)  
Old 03-23-2007
matrixmadhan matrixmadhan is offline Forum Advisor  
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Quote:
Is there awk syntax to include all fields on one line so the for loop reads 4 lines and not 12?
awk reads the line based on the record seperator,

just read and prints the line
Code:
awk '{ print }' file

Sorry if I have not understood correctly!

Could you please post the expected output ?
  #3 (permalink)  
Old 03-23-2007
prkfriryce prkfriryce is offline
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Expected/desired output:

# for x in `awk 'sub($1" +"$2" +","",$0) ' filename`; do echo $x; done
ef:ghi:jk lm:nop qrs
ef:ghi:jk lm:nop qrs
ef:ghi:jk lm:nop qrs
ef:ghi:jk lm:nop qrs

the 'for loop' separates each awk line into three variables, so instead of 4 lines, there are 12:

actual output:

# for x in `awk 'sub($1" +"$2" +","",$0) ' filename`; do echo $x; done
ef:ghi:jk
lm:nop
qrs
ef:ghi:jk
lm:nop
qrs
ef:ghi:jk
lm:nop
qrs
ef:ghi:jk
lm:nop
qrs
  #4 (permalink)  
Old 03-23-2007
matrixmadhan matrixmadhan is offline Forum Advisor  
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Code:
awk -F " " '{ print $3, $4, $5 }' filename
or

Code:
awk -F " " '{ for ( i=3; i<=NF; i++ ) { printf "%s ", $i } printf "\n" }' filename
Last edited by matrixmadhan; 03-23-2007 at 11:19 AM..
  #5 (permalink)  
Old 03-23-2007
prkfriryce prkfriryce is offline
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Posts: 44
Quote:
Originally Posted by matrixmadhan
Code:
awk -F " " '{ print $3, $4, $5 }' filename
or

Code:
awk -F " " '{ for ( i=3; i<=NF; i++ ) { printf "%s ", $i } printf "\n" }' filename
both yield the same result:

ef:ghi:jk
lm:nop
qrs
ef:ghi:jk
lm:nop
qrs
ef:ghi:jk
lm:nop
qrs
ef:ghi:jk
lm:nop
qrs

Regardless of the awk output, the 'for loop' logic still interprets each awk oupt line as a three variables. I would liek to set each awk output line as a string to be able to parse in a later function
  #6 (permalink)  
Old 03-23-2007
ghostdog74 ghostdog74 is offline Forum Advisor  
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you don't use the for loop anymore.
just execute either those 2 awk's from provided by matrixmadhan will do.
  #7 (permalink)  
Old 03-23-2007
cfajohnson's Avatar
cfajohnson cfajohnson is offline Forum Advisor  
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Join Date: Mar 2007
Location: Toronto, Canada
Posts: 2,361
Quote:
Originally Posted by prkfriryce
Expected/desired output:

# for x in `awk 'sub($1" +"$2" +","") ' filename`; do echo $x; done
ef:ghi:jk lm:nop qrs
ef:ghi:jk lm:nop qrs
ef:ghi:jk lm:nop qrs
ef:ghi:jk lm:nop qrs

the 'for loop' separates each awk line into three variables, so instead of 4 lines, there are 12:

actual output:

# for x in `awk 'sub($1" +"$2" +","",$0) ' filename`; do echo $x; done
ef:ghi:jk
lm:nop
qrs
ef:ghi:jk
lm:nop
qrs
ef:ghi:jk
lm:nop
qrs
ef:ghi:jk
lm:nop
qrs

Code:
awk 'sub($1" +"$2" +","",$0) ' filename |
  while IFS= read -r x
  do
     printf "%s\n" "$x"
  done
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