Compare files with regular expression

Thread Tools Search this Thread
# 1  
Compare files with regular expression


Reading a previous post about comparing files using awk ('awk-compare-2-columns-2-files-output-whole-line',, it is possible to adjust this, so that regular expression can be used as the criterion?

# 2  
Could you post input, output and what you tried so far?
# 3  
Not tried much yet. So far I have tried to understand the meaning of the command 'idx' but search results have not described this command. Example below:

text1 10
text2 20

text1textabc 10
text2textdef 20
text3textghi 30

#! /bin/awk -f
BEGIN {FS=","}
{idx=$1, [0-9]} FNR==NR{f1[idx];next} idx in f1 file1 file2

chmod u+x awktest
./awktest file1 file2 > file 3

awk: ./awktest:3: {idx=$1, [0-9]} FNR==NR{f1[idx];next} idx in f1 file1 file2
awk: ./awktest:3:        ^ syntax error
awk: ./awktest:3: {idx=$1, [0-9]} FNR==NR{f1[idx];next} idx in f1 file1 file2
awk: ./awktest:3:              ^ syntax error
awk: ./awktest:3: {idx=$1, [0-9]} FNR==NR{f1[idx];next} idx in f1 file1 file2
awk: ./awktest:3:                                                 ^ syntax error

file3 is empty!

Would like to be able to use regular expression as a criterion to select records that match the criterion and then create a new file in the format of file 2.

Last edited by Scrutinizer; 06-24-2012 at 04:56 PM.. Reason: code tags
# 4  
idx is a mere variable in that script, not a command.. The script is giving syntax errors, therefore file 3 remains empty...

What is your desired output with these two input files?
# 5  
In summary "where a regular expression (e.g. [0-9]) within field 1 matches both file1 and file2, export that line into file3, but in the format of file2".
# 6  
Could you give an example?
# 7  
The previous post showed the example script and the errors?

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #85
Difficulty: Easy
Windows 7, Windows 8, Windows RT, Windows Phone 8, Windows Server, and the Xbox One's operating system all used the Windows NT kernel.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to find regular expression for two files?

I have files: sum_<INPUT FILENAME>.YYYYMMDDhhmmss.csv and sum_details_<INPUT FILENAME>.YYYYMMDDhhmmss.csv I have no idea, what is input filename, but in the code I would like to catch them in case I process them in the loop above case statement for *.${Today}.*.txt... (3 Replies)
Discussion started by: digioleg54
3 Replies

2. Homework & Coursework Questions

Regular Expression to match files in Perl

Hi Everybody! I need some help with a regular expression in Perl that will match files named messages, but also files named message.1, message.2 and so on. So really I need one that will find messages and messages that might be followed by a period and a digit without matching other files like... (2 Replies)
Discussion started by: Hax0rc1ph3r
2 Replies

3. Programming

Perl: How to read from a file, do regular expression and then replace the found regular expression

Hi all, How am I read a file, find the match regular expression and overwrite to the same files. open DESTINATION_FILE, "<tmptravl.dat" or die "tmptravl.dat"; open NEW_DESTINATION_FILE, ">new_tmptravl.dat" or die "new_tmptravl.dat"; while (<DESTINATION_FILE>) { # print... (1 Reply)
Discussion started by: jessy83
1 Replies

4. Shell Programming and Scripting

How to compare a file name with a regular expression !!

Hi, I need to compare file names in a folder with several strings(which are in regular expression format): For example: there is a file "objectMyHistoryBook" and there are several strings to compare this file name with: objectMyMaths*, objectMyEnglish*, objectMyHistory*,... (2 Replies)
Discussion started by: Lucifer_123
2 Replies

5. Shell Programming and Scripting

copying files using regular expression

I have 3 files names as HU123.IHS ,SU345.IHS DU567.IHS I have written a script to copy the files to the destination server but I am getting the error. /bin/cp '/dun/homes/11.3.7/packages/HU*.IHS' /dun/homes/11.3.7/Target But I am getting one error :- /bin/cp: cannot stat... (1 Reply)
Discussion started by: maitree
1 Replies

6. Shell Programming and Scripting

search a regular expression and match in two (or more files) using bash

Dear all, I have a specific problem that I don't quite understand how to solve. I have two files, both of the same format: XXXXXX_FIND1 bla bla bla bla bla bla bla bla bla bla bla bla ======== (return) XXXXXX_FIND2 bla bla bla bla bla bla (10 Replies)
Discussion started by: TheTransporter
10 Replies

7. Shell Programming and Scripting

Regular Expression to copy files

Hi All, I have a file with the contents as below. Current_path/file1 Current_path/file2 Current_path/file3 Now i want a regular expression to copy this files to cp Current_path/file1 HOME_DIR/Current_path/file1 cp Current_path/file2 HOME_DIR/Current_path/file2 cp Current_path/file3 ... (2 Replies)
Discussion started by: girish.raos
2 Replies

8. Shell Programming and Scripting

How to apply a regular expression in all the files in a directory

I have say 100 text files (with .txt extension) in a directory. An example of the content in the file is given below "NAME" "cgd1_200" "cgd1_3210" "cgd1_560" "cgd2_2760" "cgd2_290" "cgd3_3210" "cgd3_3310" "cgd3_660" "cgd5_2130" "cgd5_4080" "cgd6_3690" "cgd6_4480" "cgd8_1540"... (2 Replies)
Discussion started by: Lucky Ali
2 Replies

9. Shell Programming and Scripting

AWK - compare $0 to regular expression + variable

Hi, I have this script: awk -v va=45 '$0~va{print}' flo2 That returns: "4526745 1234 " (this is the only line of the file "flo2". However, I would like to get "va" to match the begining of the line, so that is "va" is different than 45 (eg. 67, 12 ...) I would not have any output. That... (3 Replies)
Discussion started by: jolecanard
3 Replies

10. Shell Programming and Scripting

compare variable against regular expression?

is it possible? if so, how? i want to check a variable whether is it a number or letter in an if-else statement (6 Replies)
Discussion started by: finalight
6 Replies

Featured Tech Videos