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Why my awk doesn't work?

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Top Forums Shell Programming and Scripting Why my awk doesn't work?
# 1  
Old 10-05-2014
Why my awk doesn't work?
Code:
root@SDP_Wildcat_Pass-3-C1:~# cat /proc/driver/rtc                                 
rtc_time    : 05:29:40
rtc_date    : 2014-12-19
alrm_time    : 01:51:53
alrm_date    : 2014-12-20
alarm_IRQ    : no
alrm_pending    : no
update IRQ enabled    : no
periodic IRQ enabled    : no
periodic IRQ frequency    : 1024
max user IRQ frequency    : 64
24hr        : yes
periodic_IRQ    : no
update_IRQ    : no
HPET_emulated    : yes
BCD        : yes
DST_enable    : no
periodic_freq    : 1024
batt_status    : okay

it's wrong with below command
Code:
root@SDP_Wildcat_Pass-3-C1:~# cat /proc/driver/rtc |awk -F: "/alrm_time/{print $3}"
alrm_time    : 01:51:53

# 2  
Old 10-05-2014
Could be quoting issue

Code:
akshay@nio:/tmp$ awk -F: "/alrm_time/{print $3}" file
alrm_time    : 01:51:53

akshay@nio:/tmp$ awk -F: '/alrm_time/{print $3}' file
51

Code:
akshay@nio:/tmp$ akshay=123; awk -F: "/alrm_time/{print $akshay}" file
123

This User Gave Thanks to Akshay Hegde For This Post:
yanglei_fage
# 3  
Old 10-05-2014
What's wrong? Which result do you want to get?
# 4  
Old 10-05-2014
Quote:
Originally Posted by RudiC
What's wrong? Which result do you want to get?

to get "51"
# 5  
Old 10-05-2014
Two mistakes.
1. $3 is substituted by the shell even within "quotes". You need 'single quotes'.
2. the field delimiter : is wrong, there would be only two fields (with spaces). The default delimiter (white space) would work with $3 here. A more sophisticated delimiter is
-F ' +: +' and $2 is the value without leading spaces.
Code:
< /proc/driver/rtc awk -F ' +: +' '$1=="alrm_time" {print $2}'

---------- Post updated at 10:09 AM ---------- Previous update was at 09:51 AM ----------

Just seeing you want the second field of the value. Then the : and $3 are ok.
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