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AWK: why does $(cat) work for stdin, but $* doesn't?

echo '((3+(2^3)) * 34^2 / 9)-75.89' | awk "BEGIN{ print $(cat) }" The above syntax works fine with the calculated result '1337'. echo '((3+(2^3)) * 34^2 / 9)-75.89' | awk "BEGIN{ print $* }" But the...

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How to replace consecutive characters from directory names, recursively

What is the best way to replace all consecutive characters such as _+-."'? from a directory and all sub directory's names using GNU bash, version 4.3, using tools awk, sed, Perl rename or find? AS...

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In some places awk doesn't work in pssh command

I am trying to fetch only column using awk in OS commands like uname -a , uptime, using pssh multiple commands, But it's not giving correct output. Using "uname -a" is just an example i have shown, I...

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Change numbers to random letter in SED

Considering the following number: 145478 I want to replace these numbers with random letters from a to z. My attempt so far: sed -r 's/[0-9]/[a-z]/g' It does not change the pattern to another pattern...

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Two-file processing in awk

I have file : result.txt Apple fruits 10 20 30 Car vehicle 40 50 60 Book study 70 80 90 Assume here 2nd column is a feature, 3rd column is Min, 4th column is Median, 5th column is Max. I have another...

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Compare two files, remove line

I have one file with URL's. Example urls.txt: https://www.indeed.co.uk/cmp/Endsleigh-Insurance/reviews?fcountry=ALL&fjobtitle=Claims+Assistant<br>...

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How can I merge files on a line by line basis?

cat file1 foo ice two cat file2 bar cream hundred Desired output: foobar icecream twohundred file1 and file2 will always have the same amount of lines in my scenario, in case that makes things easier.

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Convert a string of characters to ascii values

I have been searching through the internet on how to do this but have failed to find a way to actually do it.. Basically, I have a series of large dataframes, and I wish to convert one of the column...

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awk store a pattern result to a shell array variable

I am trying to store the result of a pattern matched by awk to a shell array variable. Here's a simplified example of the same: #!/bin/bash declare -a array1=() declare -a array2=()...

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How can I store the output of an awk command as a bash script variable?...

This question already has an answer here: How do I assign the output of a command to a variable? 1 answer When operating in the linux terminal I can enter the following: command ''' awk 'FNR==1...

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extract the oldest values from a master file per each code

I need help writing a script that would extract from a master file the oldest records and save them in a separate file. The file contains hundreds of ISIN codes and additional data. For each, there...

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Nested match rules using awk

I have file content as 0::chkconfig --list autofs:: autofs 0:off 1:off 2:on 3:on 4:on 5:on 6:off 1::grep "^PROMPT=" /etc/sysconfig/init:: PROMPT=yes 2::rpm -q prelink:: prelink-0.4.0-2.el5 3::sysctl...

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How to check if a package is installed from Bash?

I need to check if a specific package is installed on a machine from within a Bash script. I found something like that but I don't know how use it correctly. dpkg -l | grep "ansible" | awk '{print...

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How cut a data file that have colums separated by spaces

I have a data file with 2 columns 1.0000 9.9398383 1.4399 8.0000000 2.5688 7.9393838 1.0000 4.0000000 1.4399 9.0094949 2.5688 3.9932323 1.0000 8.9393993 1.4399 7.3838473 1.5688 2.8337738 I want to...

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Get Non matching string from file1 to file2

I have two files - file1 & file2. file1 contains (only words): ABC YUI GHJ I8O file2 contains many paragraphs: dfghjo ABC kll njjgg bla bla GHJ njhjckhv chasjvackvh .. ihbjhi hbhibb jh jbiibi I am...

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Filter lines between matching strings

Have a contents in file similar to below- There are many lines between START & END and might have errors/warnings too. I want to filter out errors/warning lines between START & END and skip if...

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Awk-compare 2 files using multiple columns and print lines from both files

So I have a two flat files that is in the format as follows File1.txt Customer1 12345 12346 12347 15646 Customer2 14444 14445 File2.txt 12345 aol.com 12347 gmail.com 12346 google.com 14444 yahoo.com...

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compare two lines and print unmatched words from two files

I have two files,Lets say file1 and file2 file1 has "eipassoc-03cd9117d7188d2 eipasoc-47367a3f eipasoc-bbbddc3 eipassoc-10bbfb6" each one is space delimited file2 has "eipasoc-47367a3f...

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AWK: Sum columns, write them into a "final" row

My CSV looks like this A 5 3 B 3 1 ... I need to get the sum of all columns and add those to a new line in the CSV so it becomes A 5 3 B 3 1 SUM 8 4 I was able to print the sum of a particular column...

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How to use grep to match a string with spaces in it?

Can anyone help me with this: I am trying to extract a time stamp, by matching a string. For this am using combination of grep/awk commands. As the sting has 4 spces before [1] and one after, am...

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