Find string in files and subdirectories


Search for text and strings in files and subdirectories with result in variables

Usually when searching for strings in files, we use windows explorer or windows search, on Linux Gnome uses nautilus or nemo, on macOS we use the finder.

Command-Line commands help with automated processing by scripts and batch processes. This post shows how to search for strings in Windows Command Prompt and in the Linux shell.

Search in the command prompt

The Windows Command Prompt (cmd) a good use provide the findstr command, as the following example shows.

If you want to assign the result of a variable for further processing in scripts, this can be made possible in a FOR loop, the following lines are stored and executed in a CMD file.

With echo the entire line is output with the searched word dolor, if you want to narrow the output only to the characters of a word, this can be achieved with variable parameters.

From the sign 20 our word is dolor, it is 5 characters long.
The CLI input findstr dolor now brings dolor to the output found in the doc.txt file.

The var variable is assigned the output of findstr.

Searching in the Linux Shell

In the Linux bash Console does grep and find are used.

The text search with grep is as follows, the result is assigned to the variable var, and output with echo.

When searching with grep, you do not want to output the entire line, but only the third word.

There are many other possibilities especially in the Linux bash, the command find is very extensive and offers with xargs also regular expressions and other commands for handing over, with find –help you get all possible applications. The only point here is to show an introduction to the application and procedure.

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