Exclude First Line when awk

Shell Programming and Scripting
1

Hi there,

Where do I add the

 !NR==1

into the awk statement such that it ignores the first line .

awk '/1.2 Install/ {P=0} /1.1 Apply/ {P=1} P {print FILENAME, $0} ' solarisappsummary.txt solarisdbsummary.txt solaris_websummary.txt
2

Hello alvinoo,

Could you please try following and let me know if this helps.

 awk '/1.2 Install/ {P=0} /1.1 Apply/ {P=1} P && NR>1{print FILENAME, $0} ' solarisdbsummary.txt solaris_websummary.txt

Thanks,
R. Singh

3

You can just add

FNR == 1 {next} to skip first line, finally your command looks like this

awk 'FNR == 1 {next}/1.2 Install/ {P=0} /1.1 Apply/ {P=1} P {print FILENAME, $0} ' solarisappsummary.txt solarisdbsummary.txt solaris_websummary.txt
4

Hi,
try this,

awk 'NR>1{/1.2 Install/ {P=0} /1.1 Apply/ {P=1} P {print FILENAME, $0} }' solarisappsummary.txt solarisdbsummary.txt solaris_websummary.txt
5

Pravin this produces ^ syntax error

6

Hey Akshay .. Thanks

Shorten code.

awk 'NR>1 && /1.1 Apply/ {print FILENAME, $0}'  solarisappsummary.txt solarisdbsummary.txt solaris_websummary.txt
7

Also as Akshay had pointed out if multiple input files, FNR should be used instead of NR to skip first record in each input file:-

NR The total number of input records seen so far.

FNR The input record number in the current input file.
8

I wonder if suppressing the FNR==1 (first line of each file) does have an effect because

awk '/1.2 Install/ {P=0} /1.1 Apply/ {P=1} P {print FILENAME, $0}'

prints the block between 1.1 Apply and 1.2 Install .
In another thread I have already suggested to move the P condition before the 1.1 Apply (block start) condition

awk '/1.2 Install/ {P=0} P {print FILENAME, $0} /1.1 Apply/ {P=1}'

so it does not print the 1.1 Apply line.

9

May I point a fact?

This snippet does not, cannot, replace the original snippet. They are not equivalent.
The previous will print only, and ONLY, records that match the /1.1 Apply/ if is not the first record of the first file.
On the other hand:

awk 'FNR == 1 {next}/1.2 Install/ {P=0} /1.1 Apply/ {P=1} P {print FILENAME, $0} ' solarisappsummary.txt solarisdbsummary.txt solaris_websummary.txt

This one will start printing any records once that the match /1.1 Apply/ is found until it finds again the match /1.2 Install/, skipping the first record of every file.

10

Hi All,

Thanks for helping, make tag as resolved

awk '/2.1 Disable/ {P=0}  P  {print $0} FNR==1{printf("From file %s:\n", FILENAME)} /1.3 Install/ {P=1}' solarisappsummary.txt solarisdbsummary.txt solaris_websummary.txt
echo -e "2.1    Disable standard services if possible"


From file solarisappsummary.txt:
STATE          STIME    FMRI
online         Feb_05   svc:/network/ssh:default
From file solarisdbsummary.txt:
STATE          STIME    FMRI
online         Dec_29   svc:/network/ssh:default
From file solaris_websummary.txt:
STATE          STIME    FMRI
online         Jun_05   svc:/network/ssh:default
11 
 awk '{getline;print}' file
12 
$ cat numbers
line one
line two
line three
line four
line five
line six
line seven
line eight
line nine
line ten

$ awk '{getline;print}' numbers
line two
line four
line six
line eight
line ten
13

thanks Aia for pointing this out. the getline should present in the BEGIN block...