# Let's assume we have a file called data.txt with the following content:# John# Mary# Paul# John Paul# If you want to search for 'John' but don't want lines with 'Paul' to appear, you can use grep exclusion lik
How to write with grep: delete the space except the first one in the paragraph? dublove Guide , Jun 20, 2022 Copy link to clipboard There is a paragraph with many spaces inside. I need to keep the first space in each paragraph and replace all...
Next, we pipe the output as input to the tr command which replaces each occurrence of multiple spaces with a single space. Lastly, we pipe the output from tr to the grep command, which searches for lines containing the word forest and prints them. This way, we can use any of the ...
How can I do this quickly and easily with the Find/Change dialogue box/panel? I suspect there is a way to do this using GREP, but I am totally new to GREP and cannot find or figure out the code to put in the "Find what:" and the "Change to" fields...
$ grep 'r.*t' /etc/passwd As far as the shell is concerned, all characters between the two single quotes, including spaces, make up a single parameter. Therefore, the following command does not work, because it asks the grep command to search for the string r.*t /etc/passwd in the...
grep -Ei [[:digit:]]{4} /etc/passwd Search For a String in File The above example may not be the best case for the use of regular expressions in the real world, but it clearly illustrates how to usePOSIXcharacter classes to analyze text along withgrep. ...
Finding and Printing Files Names Without White Spaces Unlike the default-printparameter, the-print0option lets you clear white spaces or newline characters in a search result returned by thefindcommand. Especially when you’re passing the result to another command likegrepto search for patterns. ...
$ grep ^[^#] /etc/postfix/main.cf What if you have lines starting with somespacesortabsother then#or;character?. You can use the following command which should also remove empty spaces or lines in the output. $ egrep -v "^$|^[[:space:]]*;" /etc/php/7.1/cli/php.ini ...
Working with spaces and quotation marks Spaces are used for separating commands, options, and arguments. Use quote marks to tell the Bash shell to ignore all special characters, of which a white space is a special character. When the Bash shell sees the first quote mark, it ignores special ...
$ grep r.*t /etc/passwd It works most of the time, but sometimes it mysteriously fails. Why? The answer is probably in your current directory. If that directory contains files with names such as r.input and r.output, then the shell expands r.*t to r.input r.output and creates this...