Feb 28, 2017 · If you are looking for a shell utility to do something like that, you can use the cut command. To take your example, try: echo "abcdefg" | cut -c3-5 which yields cde Where -cN-M tells the cut command to return columns N to M, inclusive.

Mar 18, 2024 · In this article, we’ve addressed different approaches to check if a string contains a specific substring. We’ve reviewed some shell builtins and the utilities grep, sed, awk, and Perl that comes pre-installed on most Linux systems.

Apr 30, 2010 · Typically, $ {somename} will substitute the contents of a defined parameter: The % and # symbols are allowing you to add commands that modify the default behavior. The asterisk '*' is a wildcard; while the pipe '|' is simply a matching character. Let me do the same thing using the matching character of '4'.

Jun 13, 2017 · For the portable way to test if an string contains a substring, use: file="JetConst_reco_allconst_4j2t.png"; testseq="gen" [ "${file##*$testseq*}" ] || echo True Substring is present Or "${file##*"$testseq"*}" to avoid interpreting glob characters in testseq.

May 14, 2011 · The correct usage for the given SUBSTRING is fnmatch "*$SUBSTRING*" "$STRING1". Other than that, +1 for correct syntax and optimization. if [[ `echo "$1" | grep "$2"` != "" ]]; then return 1; fi. return 0; echo $? Running that script: If you want to do it without forking grep, read this link -> bash string manipulation.

Apr 9, 2025 · Extracting a substring from a string is a fundamental and common operation of text processing in Linux. In this tutorial, we’ll examine various ways to extract substrings using the Linux command line.

Oct 31, 2023 · There are several ways to check if a Bash string contains a substring. In this comprehensive guide, we will explore the various methods to search for substrings in Bash.

Dec 6, 2023 · Bash substring extraction allows us to precisely cut out the parts of a string we need, providing a versatile and handy tool for various tasks. In this guide, we’ll walk you through the process of working with substrings in Bash, from their extraction, manipulation, and usage.

Mar 23, 2024 · Learn how to check if a string contains a substring and execute actions based on the result. Handle multiple substrings, ignore case sensitivity, and perform partial matches using if, case, and grep commands.

Aug 7, 2023 · Bash is the default shell for Linux and provides a variety of string manipulation tools. Use the if statement and the [[...]] test operator to check if a string contains a substring. Alternatively, use the grep command to search for a substring within a file or output.