9/26/2023 1 Comment Grep multiple strings in a fileI also have a List.txt file which contains strings of filenames, ie: ‘12345’. I started by finding all files within a certain directory which contains a bunch of sub directories and such by ‘dir * /s/b | findstr “.*\.*”‘ I pipped the results to a DirectoryListing.txt file to store all the paths. I’ve been trying to find filenames that start with a certain string. What do you do with this filter command “findstr”? This command can be useful in many cases especially when I am creating a log of network activities and have to find a specific thing from the log. You can go through all the switches you can use with the command here. If you don’t specify /M, the output will show the exact text string along with the file name where it found the string. This will give a list of all files with full path containing the text string “reader”. You can also specify a folder for finding a specific text string in multiple files.įindstr /M “reader” “C:\Users\Usman\Desktop\*” find text string in a file Search for a specific string in a folder using Findstr You can also give full path of the file if it’s not in the same directory as opened in command prompt. Search for a specific string inside a single file Using Command Prompt This will show me only secure imap ports opened on my computer. Netstat | findstr “imaps” Findstr filtering imaps ports If I want to check which app or IP address is connected to a specific port, I’ll use the following command: If you want to filter the results of a command, you can use | findstr “string_to_find”įor example, I mostly use netstat for checking the connections being made on my computer. Search for a specific string in a folder using Findstrįilter an output of a command Using Command Prompt.Search for a specific string inside a single file Using Command Prompt.Filter an output of a command Using Command Prompt. You can also run the man command to check the grep command manual page for finding more options. The words that you searched are highlighted in red. You can see the output of this command in the given image. grep -color -i 'warning\|error\|critical' /var/log/syslog grep 'warning\|error\|critical' /var/log/syslogīy default search is case sensitive you can make it insensitive by using the option -i we also recommend using option -color to highlight these words. Use option -w with the above command to display only lines that contains these words. Now execute the given command to find these words – grep 'warning\|error\|critical' /var/log/syslog In our example, we will find the warning, error, and critical words in /var/log/syslog which is a log file that stores global system activity data. The strings are the most basic patterns that we use with the grep command. grep -E 'pattern1|pattern2|pattern3' file How to grep multiple strings in a Single Command When using this syntax do not use the escape sequence i.e. You can use option E with the grep command to interpret the pattern as the extended regular expression. grep 'pattern1 \|pattern2\|pattern3' file To search for multiple patterns with the basic regular expression syntax you can use the command as it is given below. egrep 'pattern1|pattern2' *.txtĪnother one is Perl compatible syntax you can try this on older Unix shells. Next is the extended regular expression which is given below. The grep command supports three types of the regular expression. The pattern or sequence of character that you want to search using grep in one or more files is known as a regular expression. How to grep multiple Strings on a Linux or Unix system For basic usage of this command, you can read the grep command in Linux.
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