Visit Our UNIX and Linux User Community

Using sed to change file into an awk script

Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers Using sed to change file into an awk script
# 1  
Old 08-18-2019
Using sed to change file into an awk script

Hi I want to use sed to change a text files input into an awk script.
For example if the input says " chord -- english " I want to change this using sed 's/pattern 1 /pattern 2 /'g filename but I don't understand how to use part of the pattern 1 to input that into pattern 2 . Like after using sed chord-- english should look like this awk '/pattern 1/ {awk function}' filename.

Any help will be appreciated.

Last edited by jim mcnamara; 08-18-2019 at 10:53 AM..
# 2  
Old 08-18-2019
Not sure I understand the request. You have a text file processed by awk and want it preprocessed by sed? Why don't you do all of it in awk itself?
# 3  
Old 08-18-2019
Do you need distinct awk functions for every line of text or just a few functions? Sample input, output would help a lot.

Edit: I don't understand the request either....
This User Gave Thanks to jim mcnamara For This Post:
# 4  
Old 08-18-2019
Actually, my main issue is that I want to use part of the pattern 1 in pattern 2 in sed. Like so

-sagot this should change to /sagot$/{count++}
-sagot- this should change to /sagot/{count++}
sagot- should change to /^sagot/{count++}

so basically I need to change according to the position of '-' and use the word in pattern 1 without hard coding it treating as if it is a variable because I have to run this on a big file and cannot write all the combinations.
# 5  
Old 08-18-2019
That's what "back references" (man regex / man sed) are for. But I think your "ansatz" is flawed - you could use the "pattern1" in awk only with tricks.
Paint the whole picture, include sample input and output data, and you might receive proposals to solve the whole picture.
# 6  
Old 08-18-2019
I have to use sed to transform every line into an awk code

Last edited by enforcer; 08-20-2019 at 12:10 AM..
# 7  
Old 08-18-2019
Hmm. Assuming the file looks like your example -
FWIW you can do this many ways, you may be over thinking your task.

greek=$(grep -c "[Gg]reek$" infile)
latin=$(grep -c "[Ll]atin$" infile)
echo "greek= $greek   latin= $latin"

This provides the same information your awk preprocessing generates, with no intermediate files. And ignores upper/lowercase issues.

Previous Thread | Next Thread
Test Your Knowledge in Computers #430
Difficulty: Medium
Variables in JavaScript can be defined using either the var, let, static or const keywords.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Datestamp format 2nd change in csv file (awk or sed)

I have a csv file formatted like this: 2014-08-21 18:06:26,A,B,12345,123,C,1232,26/08/14 18:07and I'm trying to change it to MM/DD/YYYY HH:MM for both occurances. I have got this: awk -F, 'NR <=1 {print;next}{"date +%d/%m/%Y\" \"%H:%m -d\""$1 "\""| getline dte;$1=dte}1' OFS="," test.csvThis... (6 Replies)
Discussion started by: say170
6 Replies

2. Shell Programming and Scripting

sed/awk script to replace only FIRST comment in the file

My first comment on every file contains the license message. I want to replace with a new license message. I used the below sed script, which replaces all comments. What is the modification or any other method with awk script for the below to edit only the first comment(license message)? #sed -f... (1 Reply)
Discussion started by: vpshastry
1 Replies

3. Shell Programming and Scripting

sed substitution or awk, need to direct change the file

I want change the file when the line contains $(AA) but NOT contains $(BB), then change $(AA) to $(AA) $(BB) eg: $(AA) something $(AA) $(BB) something (7 Replies)
Discussion started by: yanglei_fage
7 Replies

4. Shell Programming and Scripting

Creating a sed script to change ip addresses in a file

So I'm new to this sed command and I am trying to create a script that replaces ip addresses when I name a file but can't tweak it to work. Here is what it looks like: #!/bin/bash # file=$1 # sed -e 's/-CPUaddr' -i "$file" sed -e 's/-CPUaddr... (10 Replies)
Discussion started by: uradunce
10 Replies

5. Shell Programming and Scripting

Need help with a script to process a CSV file using SED and AWK

I get a CSV file every day with 2 columns and multiple rows ex: date1,date2 ( both the fields are varchar fields) This data has to be updated in a table which is being done manually and i want to automate that. 1. I have to select all the data from the prod table( 2 columns { date1,date2}) into... (4 Replies)
Discussion started by: kkb
4 Replies

6. Shell Programming and Scripting

To parse through the file and print output using awk or sed script

suppose if u have a file like that Hen ABCCSGSGSGJJJJK 15 Cock ABCCSGGGSGIJJJL 15 * * * * * * : * * * . * * * : Hen CFCDFCSDFCDERTF 30 Cock CHCDFCSDHCDEGFI 30 * . * * * * * * * : * * :* : : . The output shud be where there is : and . It shud... (4 Replies)
Discussion started by: cdfd123
4 Replies

7. Linux

SED/AWK Script to clear log file using timestamp?

I have a log file on our system which fills up with lines that have been timestamped, as follows.... 03/03/2008 10:56:06:815] (ERROR) balance: continuing session to genapp02 : 18500 03/03/2008 10:56:06:820] (ERROR) balance: continuing session to genapp02 : 18500 03/03/2008 10:56:07:003]... (2 Replies)
Discussion started by: davesimm
2 Replies

8. Shell Programming and Scripting

awk/sed/ksh script to cleanup /etc/group file

Many of my servers' /etc/group file have many userid's that does not exist in /etc/passwd file and they need to be deleted. This happened due to manual manipulation of /etc/passwd files. I need to do this for 40 servers. Can anyone help me in achieving this? Even reducing a step or two will be... (6 Replies)
Discussion started by: pdtak
6 Replies

9. Shell Programming and Scripting

How to change ip using awk or sed .

How to change ip using awk or sed . #cat /etc/hosts server1 server2 server3 server4 server5 Output: server1 server2 server3 server4 server5 (9 Replies)
Discussion started by: kenshinhimura
9 Replies

10. Shell Programming and Scripting

filter parts of a big file using awk or sed script

I need an assistance in file generation using awk, sed or anything... I have a big file that i need to filter desired parts only. The objective is to select (and print) the report # having the string "apple" on 2 consecutive lines in every report. Please note that the "apple" line has a HEX... (1 Reply)
Discussion started by: apalex
1 Replies

Featured Tech Videos