Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Capture the last record number using "awk" NR variable

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Capture the last record number using "awk" NR variable
# 8  
Old 02-08-2017
Expanding a bit on what Corona688 said, and commenting on your own proposal in post#4: See what happens if your (syntactically corrected) code (action "print" assumed) works on a file like
Code:
cat file
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 1 2 3 4 5 6 7 8 9 A B C D E F
awk '{for(i=1;i<=NR;i++) printf "%s ", $i; printf RS}' file
0 
0 1 
0 1 2 
0 1 2 3 
0 1 2 3 4 
0 1 2 3 4 5 
0 1 2 3 4 5 6 
0 1 2 3 4 5 6 7

Last edited by RudiC; 02-09-2017 at 03:21 AM..
# 9  
Old 02-08-2017
In awk one normally loops over the fields. NF is the number of fields.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk variable into shell command "date -d": possible...?

Hello, there! I am trying to pass an awk variable into a shell command in order to collect the result into an awk variable; in Bash it does work, as in: v='2'; date -d "now + $v weeks" But in awk it does not, as in: v="2" "date -d 'now + v weeks'" | getline newdate close ("date -d 'now... (3 Replies)
Discussion started by: fbird3
3 Replies

2. Shell Programming and Scripting

Variable interpolation in "print" of awk command

Hi, I have a snippet like below. Based on variable i, i wish to print 1,2,3,4,5th columns to Sample files. For each loop, one column from contetn and results will be pused to sample files. But i have a problem here i=1 while ; do `awk -F"\t" '{print $($i)}' $content > Sample_${i}_original`;... (4 Replies)
Discussion started by: forums123456
4 Replies

3. Shell Programming and Scripting

how to use "cut" or "awk" or "sed" to remove a string

logs: "/home/abc/public_html/index.php" "/home/abc/public_html/index.php" "/home/xyz/public_html/index.php" "/home/xyz/public_html/index.php" "/home/xyz/public_html/index.php" how to use "cut" or "awk" or "sed" to get the following result: abc abc xyz xyz xyz (8 Replies)
Discussion started by: timmywong
8 Replies

4. Shell Programming and Scripting

awk command to replace ";" with "|" and ""|" at diferent places in line of file

Hi, I have line in input file as below: 3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL My expected output for line in the file must be : "1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL" Can someone... (7 Replies)
Discussion started by: shis100
7 Replies

5. Shell Programming and Scripting

cat $como_file | awk /^~/'{print $1","$2","$3","$4}' | sed -e 's/~//g'

hi All, cat file_name | awk /^~/'{print $1","$2","$3","$4}' | sed -e 's/~//g' Can this be done by using sed or awk alone (4 Replies)
Discussion started by: harshakusam
4 Replies

6. Shell Programming and Scripting

help for saving vertical datas to horizontal with "awk" or "cut"

hi, i have a file having datas like that ./a.txt 12344 12345 12346 12347 ..... ..... ... i want to save this datas to another file like that ./b.txt 12344 12345 12346 12347 ... ... ... i think awk can make this but how? :) waiting for ur help. (3 Replies)
Discussion started by: mercury
3 Replies

7. Shell Programming and Scripting

Sed - How to escape variable number of "/" (slash) ?

Hi, Can you tell me how to escape a variable number of slash characters in sed "/" ? In the script the code looks like this: cat $file_to_update | sed s/^$param/$param=$tab2*\#\*/1 And the $tab2 value is a path so it will have a number of "/" charracters. # cat db.cfg | sed... (4 Replies)
Discussion started by: majormark
4 Replies

8. UNIX for Dummies Questions & Answers

Explain the line "mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`"

Hi Friends, Can any of you explain me about the below line of code? mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'` Im not able to understand, what exactly it is doing :confused: Any help would be useful for me. Lokesha (4 Replies)
Discussion started by: Lokesha
4 Replies

9. Shell Programming and Scripting

How do "if [ $variable -eq "a number" ] ?

In particular I'm trying to check if a line contains an IP address and then do something with it. The file contains some lines that have no numbers, some blank lines, and some lines with only IP addresses. #!/bin/bash touch file2.txt cat file1.txt | \ while read line do if *.*.*.* ];... (4 Replies)
Discussion started by: earnstaf
4 Replies

10. UNIX for Dummies Questions & Answers

How to count number of occurrences of a "|" from a variable?

I have a variable, var="some1|some2|some3" I want to know how many "|" are in $var. When I say echo $var | grep -c '|' I am getting only 1 :confused: :confused: :confused: ? (4 Replies)
Discussion started by: jingi1234
4 Replies
Login or Register to Ask a Question