Adding a Column of values in a tab delimited file
How can I add a Column of values in a file which has a certain number of rows.
I have a input file like this:
shell-script
Bash variable substitution of variable followed by underscore
The variable BUILDNUMBER is set to value 230. I expect 230_ to be printed for the command echo $BUILDNUMBER_ but the output is empty as shown below.
Diff, show modified line from right file only
I have file a and b and I would like to output lines of b that changed since it was cloned from a. Just the modified lines, no surrounding context, no diff offset marks.
Add lines to the beginning and end of the huge file
I have the scenario where lines to be added on begining and end of the huge files.
whiptail or dialog
I am going to create a script which will use user input, so I decided to use whiptail.
Create sub-directories and organize files by date
I have some directories of files copied from my security camera that I would like to organize into sub-directories by file date. So for example;
How do I test to see if an application exists in $PATH?
I’m trying to write all of my sh startup/env scripts to work with as much DRY and as much: “works on every *nix I clone it to”, as possible. This means making sure that if I try to run code that’s not there, that the code fails gracefully. To that end I need to be able to test if programs exist. I know how to test if a file exists, but I’m not sure how to test to see if an application is executable within the path. I’d rather use the $PATH, as some of these need to work on arch, ubuntu, and centos. Some might be installed in my homedir, on systems where I don’t have root, others might not be installed, and others yet my be installed in system paths.
How to sort the string which combined with string + numeric using bash script?
This is the data what I want to sort. But sort treats the numeric to string, the data it no sorted as I expected.
sed with multiple expression for in-place argument
I am trying to replace multiple words in a file by using
Choose interpreter after script start e.g. if/else inside hashbang
Is there any way to dynamically choose the interpreter that’s executing a script? I have a script that I’m running on two different systems, and the interpreter I want to use is located in different locations on the two systems. What I end up having to to is change the hashbang line every time I switch over. I would like to do something that is the logical equivalent of this (I realize that this exact construct is impossible):