Tag: awk

compare columns from different files and print those that DO NOT match

I have two files, file1 and file2. I want to compare several columns – $1,$2 ,$3 and $4 of file1 with several columns $1,$2, $3 and $4 of file2 and print those rows of file2 that do not match any row in file1. E.g. file1 file2 I want to have as output: I have seen questions asked here for finding

How To replace leading zero with spaces in linux?

awk linux sed

i have text like this i want to the result like this i have been searching all over and get no result, please help Answer With gawk you can use gensub: Or same pattern with sed:

Fastest way to extract pattern

awk grep linux sed

What is the fastest way to extract a substring of interest from input such as the following? Desired output (i.e., the :-terminated string following the string MsgTrace(65/26) in this example): noop I tried the following, but without success: Answer grep by default returns the entire line when a match is foun…

Re-arranging lines after a pattern in a file according to a specific order

awk linux sed shell unix

I have a large log file with the below format I have created a shell script that insert those values in the database in the same order val1, val2, val3 ,val4 The problem is that the files sometimes gets corrupted and the variables come in different order, like below for example: Using shell script, I want to …

AWK – Show lines where column contains a specific string

awk bash linux sorting

I have a document (.txt) composed like that. And I want to show some information by column. For example, I have some different information in “info3” shield, I want to see only the lines who are composed by “test” in “info3” column. I think I have to use sort but I’m …

How to grep string and show previous word in a Linux file

awk bash grep linux sed

i have a file with a lot of IPs and each IP have an ID, like this: Below this Ips and after these Ips the file have more information, its a output to an API call.. I need, grep a IP and then the command shows the id, just the number. Like this: EDIT: More information, the ip will be

How to remove certain lines of a large file (>5G) using linux commands

awk file-processing linux sed

I have files which are very large (> 5G), and I want to remove some lines by the line numbers without moving (copy and paste) files. I know this command works for a small size file. (my sed command do not recognize -i option) This command takes relatively long time because of the size. I just need to remov…

How To Delete A File Every X Times A Script Is Run – Manage A Log File From Inside A Script?

awk bash grep linux sed

I would normally just schedule this as a cron job or script, however, I would like to delete a log file (it’s constantly appended to every time a script runs) only after 50 times. Needed Inside The Script: The thing is, since the script does not run consistently, it has be to be implemented within the s…

Converting date format in bash

awk bash linux shell

I have similar different file of the format backup_2016-26-10_16-30-00 is it possible to rename using bash script to backup_26-10-2016_16:30:00 for all files. Kindly suggest some method to fix this. Original file: backup_2016-30-10_12-00-00 Expected output: backup_30-10-2016_12:00:00 Answer To perform only th…

Storing awk manipulation in variable

awk bash linux text-processing

I have two text files in tab delimted format like following. file_1 file_2 these two file contents were stored into two different variables. Now I would like extract the lines which has “+” symbol in column 4 and store it in the variable and later print it. But it throws me error message: Here is …