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Shell Programming and Scripting

redirect frintf to a variable

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# 1  
Old 09-27-2011
redirect frintf to a variable
how to redirect printf to a variable
# 2  
Old 09-27-2011
Code:
$ a=$(printf "%08x" 22)
$ echo $a
00000016

# 3  
Old 09-27-2011
Quote:
Originally Posted by jlliagre
Code:
$ a=$(printf "%08x" 22)
$ echo $a
00000016

this is not working Smilie

here is my code for

Code:
#!/bin/bash
FREE=`free -m | awk '/^Mem:/	{ printf( "%s\n", $4 ); }'`
USED=`free -m | awk '/^Mem:/	{ printf( "%s\n", $3 ); }'`
TOTAL=`expr $FREE + $USED`
awk -v TOTAL=$TOTAL -v FREE=$FREE -v USED=$USED '
BEGIN {
 printf "FREEPER: %3.2f%%\n", FREE / TOTAL * 100
 printf "USEDPER: %3.2f%%\n", USED / TOTAL * 100
 exit
}'

i would like to pass each printf output to a variable
# 4  
Old 09-27-2011
I don't follow your explanation, but...
Code:
#!/bin/bash
free -m | awk '/^Mem:/ { f+=$4; u+=$3 } END {t=f+u; printf("FREEPER: %3.2f\n USEDPER: %3.2f\n", f/t*100, u/t*100)}'

# 5  
Old 09-27-2011
Quote:
Originally Posted by vgersh99
I don't follow your explanation, but...
Code:
#!/bin/bash
free -m | awk '/^Mem:/ { f+=$4; u+=$3 } END {t=f+u; printf("FREEPER: %3.2f\n USEDPER: %3.2f\n", f/t*100, u/t*100)}'

this is really simplified but any chance to pass FREEPER and USEDPER to two variables
# 6  
Old 09-27-2011
Quote:
Originally Posted by robo
this is really simplified but any chance to pass FREEPER and USEDPER to two variables
it's possible:
Code:
free -m > /tmp/foo$$; eval $(awk '/^Mem:/ { f+=$4; u+=$3 } END {t=f+u; printf("FREEPER=%3.2f\nUSEDPER=%3.2f\n", f/t*100, u/t*100)}' /tmp/foo$$); rm /tmp/foo$$; echo $USEDPER

What is it that you're after?
Most likely you don't have to pass the variables back to shell - everything could be down within awk itself...
# 7  
Old 09-27-2011
Quote:
Originally Posted by vgersh99
it's possible:
Code:
free -m > /tmp/foo$$; eval $(awk '/^Mem:/ { f+=$4; u+=$3 } END {t=f+u; printf("FREEPER=%3.2f\nUSEDPER=%3.2f\n", f/t*100, u/t*100)}' /tmp/foo$$); rm /tmp/foo$$; echo $USEDPER

What is it that you're after?
Most likely you don't have to pass the variables back to shell - everything could be down within awk itself...
to make this script run in continues time intervals
if for certain time span the USEDMEM is high then generate an ALERT
also avoiding using cron job
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