Grep wc11/30/2023 As the name suggests it will count the lines, words or byte count from any file. Wc is a utility whose name stands for “word count”. In case you are editing or playing with text files on a terminal then these tools will surely make your life easy.įor this article let’s have a look at wc, sort, tr, and sed commands. We all know that using a terminal is more efficient to use the system. Let’s have a look at some command line utilities which really come in handy when you’re the guy that likes to stick with the terminal rather than using a GUI. It can also both ignore case and count the number of lines that match your request.Linux distributions are great to use and they have some tricks under their sleeves which users may not be aware of. In fact, it can look for multiple strings in several different ways. The grep command can do a lot more than find each instance of a single string in a text file. The commands below generate the same results as the previous two commands without piping the output to the wc command: $ grep -c 'it' recording_commands Instead of using the wc command to count the lines in the grep output, you can use the grep command itself. $ grep -i 'it' recording_commands | wc -lĪnd here's a little surprise. In the examples below, the word "it" is found 10 times in the first case and 11 times when the -i option is used. To find strings in text files regardless of whether the letters are in uppercase or lowercase, use the grep command's -i (ignore case) option. The command below does not find the string. Note that the grep -e command will allow you to search for strings that begin with a hyphen. $ grep -w 'fly\|sessio' recording_commands In other words, type "script" and each command that Their history command numbers during a single login session. When you first open a session on the command line, the oldest commands in $ grep -w 'fly\|session' recording_commands In the examples below, the line containing the word "session" is only included when the full word is used in the command. The command below fails to find the word "xray" because the "y" is omitted and the -w option is used. If you only want to find exact matches for your strings, use a command like the one below that will only display strings when they are included in the file as full words – not substrings. $ grep -e ^xr -e tape -e hope -e boat 4letters In this case, each string is included following its own -e. The same search can be performed using grep's -e option. The command will display any lines in the file that contain the word "xray", the word "tape" or both. In the command below, the '|' character serves as an "or" function. There are a number of ways to search for a group of strings in a single command. The wording suggests there was more to the story than anyone wanted to admit. This "find string in file" command will show all the lines in the file that contain the string, even when that string is only part of a longer one. The simplest grep command looks like the one shown below. This post shows how to use grep in all these ways. It can also ignore case when needed, and it can count the lines in the resulting output for you. It can be used to search through these files for multiple strings or regular expressions at the same time. The grep command makes it easy to find strings in text files on Linux systems, but that's just a start.
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