Visit Our UNIX and Linux User Community


awk with (if condition)


 
Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers awk with (if condition)
# 8  
Old 05-01-2020
Quote:
Originally Posted by RudiC
Try this:
...
Name unquoted is an uninitialized variable name defaulting to "". Any empty $1 in sight?
And that is why I dont understand why $1 == Name removes the "Name" line and shows the remaining values...
Because $1 is not empty -> it contains 'Name'... (and then the names...)

Cant wrap my head around that.
(can you 'follow' my confusion?)

And the TO did/does not want the header-line shown, that is why I settled for $1 ==! "Name"
# 9  
Old 05-01-2020
Quote:
Originally Posted by sea
And that is why I dont understand why $1 == Name removes the "Name" line and shows the remaining values...
It doesn't. It would remove any line with an emtpy $1, of which there is none. You can leave it out entirely. The $4 < 7000 removes the header line. $4 > 7000 would not; we'd need a different criterion, then.



Quote:
And the TO did/does not want the header-line shown, that is why I settled for $1 ==! "Name"
Hmm - that ==! is a construct that I can't get my head around. It obviously is a correct syntax - no complaints by the interpreter. So the == must be separated from the ! which then logically negates the NAME variable's contents and results in a 1 or 0 which in turn is tried to be matched against $1. And, so it is. Add a line starting with a 0 or 1 and see what's going to happen.
These 2 Users Gave Thanks to RudiC For This Post:

Previous Thread | Next Thread
Test Your Knowledge in Computers #333
Difficulty: Easy
Linux was first developed as an alternative to Windows XP.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

If condition on awk

Hi All, Would you guys help me? I have a file that consists of several unstructured fields. in this file I will take the code field and count_berry field. but the position of the count_berry field is always changing.the column for code is always structured, which is found in column 6 I have... (4 Replies)
Discussion started by: kivale
4 Replies

2. Shell Programming and Scripting

Using like operator in awk if condition

Hello All, I have developed a script which selects a particular filed from a file ,trims it,searches for a particular pattern and then mail it when found. cat test_file.txt |sed -n '5,$p'|sed -e 's/ //g'|awk -F'|' '{if ($4 !="Alive") print $1,$2,$3,$4}' >> proc_not_alive.txt It is... (4 Replies)
Discussion started by: karthik adiga
4 Replies

3. Shell Programming and Scripting

If Condition in awk

Hi All, I have the below Input: 1 700 1200 400 1300 2 2000 1000 2000 1500 600 3 1400 200 1000 1000 1200 4 1300 500 600 200 I want to modify the field 5 and field 4 as below. If value in field 5 is null then value of field 4 should be in field 5. and then the value of... (12 Replies)
Discussion started by: am24
12 Replies

4. Shell Programming and Scripting

awk condition

Hi Gurus, one of my current script, there is awk statement as below: awk '{a=a?a" "$3:$3}END{for (i in a) print i,a}' I don't understand what's "{a=a?a" "$3:$3}" mean? can anybody give me a brief explaination. thanks in advance. (3 Replies)
Discussion started by: ken6503
3 Replies

5. UNIX for Dummies Questions & Answers

awk - if else condition

Need help in awk command. Need to check 4th column of a file, if it is CAR then awk should print as is and if 4th column is not present, awk should print BIKE Input File content : 1,abc,55,CAR 3,bb,dd,CAR 5,ddd,tttt 8,ee,55 --------------------- Out put will look like: 1,abc,55,CAR... (6 Replies)
Discussion started by: vegasluxor
6 Replies

6. Shell Programming and Scripting

awk - Division with condition

Hi Friends, I have an input file like this cat input chr1 100 200 1 2 chr1 120 130 na 1 chr1 140 160 1 na chr1 170 180 na na chr1 190 220 0 0 chr1 220 230 nd 1 chr2 330 400 1 nd chr2 410 450 nd nd chr3 500 700 1 1 I want to calculate the division of 4th and 5th columns. But, if... (3 Replies)
Discussion started by: jacobs.smith
3 Replies

7. UNIX for Dummies Questions & Answers

Condition check using awk

Hi, I have a file in the following format "SYLVESTER,WILLARD G"|"S00633600"|"221052958A"|"H2256"|"015"|""|"00000042BASJ"|"665303"|"N"|"20100211"|"380.4"|""|""|""|"5400"|"20110218"|""|"20110218"|"FEESC"|"D"|"F"|"P" "PURINGTON-KELLEY,C"|"S00808783"|"029424717A"|"H2256"|"024"|"MEMBER JOINED... (3 Replies)
Discussion started by: nua7
3 Replies

8. Shell Programming and Scripting

HELP with AWK one-liner. Need to employ an If condition inside AWK to check for array variable ?

Hello experts, I'm stuck with this script for three days now. Here's what i need. I need to split a large delimited (,) file into 2 files based on the value present in the last field. Samp: Something.csv bca,adc,asdf,123,12C bca,adc,asdf,123,13C def,adc,asdf,123,12A I need this split... (6 Replies)
Discussion started by: shell_boy23
6 Replies

9. Shell Programming and Scripting

awk if condition help

Hi, I need little help with awk's if condition statement. I have following code: $ ssh myRemotehost 'ps ww -fu tomcat ' | awk ' { if ($1 == "tomcat") print "tomcat (pid " $2 ") is running... "; else print "tomcat stopped or dead" }' Prints: tomcat stopped or dead tomcat (pid 12345) is... (6 Replies)
Discussion started by: davidtd
6 Replies

10. Shell Programming and Scripting

awk and condition help

Hi... i just want to write a script for the follwing command "display status" and the normal output is... AN100> display status 12.13.2006 12:03:25 AN-2000-1 CC NOT PRESENT 16.50.80.49 status: Status for PACKET GLI A in the TOP / LEFT shelf of frame 0: status: The current active LAN is... (5 Replies)
Discussion started by: gini
5 Replies

Featured Tech Videos