awk script problem

[Asad Malik]

Hi
I type this on command line and get the desired output
#cat /var/adm/syslog/syslog.log |awk '$1 == "Mar" && $2 == "12" {print}'

This will print messages for Mar 12

I put this in script called as chklog, and run it like "chklog Mar 12"and it does not work.

h=$1
k=$2
cat /var/adm/syslog/syslog.log |awk '$1 == "$h" && $2 == "$k" {print}'

nothing prints.

Any suggestion

[Madhu Sudhan_1]

Malik :
Try

h=$1
k=$2
awk '$1 == "$h" && $2 == "$k" {print $0}' /var/adm/syslog/syslog.log

...Madhu

[Asad Malik]

Hi Madhu
It does not work

[Rita C Workman]

Well if your wanting to read particular days in syslog..here's a quick script:
#!/bin/sh
#
print -n "Enter 3char Month: "
read mon
print -n "Enter the day: "
read day
awk ' BEGIN {
while ( "cat '/var/adm/syslog/syslog.log' " | getline ) {
if ( $1 ~ '$mon' && $2 ~ '$day' ) print $0 }
} ' echo $0

This will allow you to select ANY day and have it echo to the screen...

/rcw

[Rita C Workman]

oops...I missed a line..
before the if ($1 ... statement
enter on a line by itself
entries++

Sorry 'bout that,
/rcw

[Rodney Hills · Accepted solution]

The problem is occuring because you are using single quotes (') around the awk script. $h and $k are not expanded in that case. The proper way is to use the -v option of awk.

cat /var/adm/syslog/syslog.log | awk -v h=$1 -v k=$2 '$1==h && $2==k {print}'

The -v sets awk variables h and k to $1 and $2 (parameters on your shell script). The awk script can then compare $1 to h and $2 to k to look for matches.

[James R. Ferguson]

Hi:

Try this:

# h=Mar
# k=12
# cat /var/adm/syslog/syslog.log|awk -v h=$h -v k=$k '$1==h && $2==k {print}'

...JRF...

[Ed Ulfers]

I had the same problem with some of my automated script, it stems from the single quote(') not evaluating the variable substitution.
Try the following:

h=\$1==\"$1\"
k=\$2==\"$2\"

awk "($h) && ($k) {print}"

This does work fine for me.
The single quote (') versus the double quote (") and backslashing characters (prefixing with \) can get very confusing, good luck in the future.