A reason why I like pdfgrep is that it tries to be compatible with GNU Grep.
Pdfgrep is a very handy tool if you are dealing with PDF files and want the functionality of ‘grep’, but for PDF files. I do not have a password-protected file to demonstrate with, but you can use this option in the following manner: pdfgrep -password Conclusion All you have to do is use the –password option, followed by the password. Yes, pdfgrep supports grep-ing even password-protected files. Look closely at the time indicated by ‘real’ value.Īs you can see, the commands that include –cache option were completed faster than the ones that didn’t include it.Īdditionally, I suppressed the output using the –quiet option for faster completion. Use -v to find and print all inverse (non-matching) lines. Use a combination of -c and -i to refine the search. Use -c to find and print the number of line matches. roottest grep -n Hello example.txt 2:Hello World 3:Hello Worlds 4:Hello Moon.
To show the speed difference, I used the time command. Use -n to find and print matches and include line numbers. Twice with cache enable and twice without cache enable. The below example searches adpatch. ps -efgrep -v oracle (8) We can use the grep -w option for searching the specific work, not the sub-string. It will not show the lines which have oracle string in it. See below examples with single and double quotes.While not the be-all and end-all, I carried out a search 4 times. We can use grep -v to exclude the search item. My shell is NAME1 which is assigned with Nathan. You can use double quotes as well when you want to send bash variable in to search term.Įxample 6: Search for a shell variable in a file. output: /bin/bash fun() echo 'This is a test.' Terminate our shell script with. Example-6: To Invert match using grep -v cat test.sh /bin/bash fun() echo 'This is a test.' Terminate our shell script with success message exit 1 fun() grep -v exit test.sh. You may get a doubt why single quotes and not double quotes. for substring search we should not use -w option. This output have two issuesġ) Grep is considering second word in the command as fileĢ) Grep is considering just “Easy†as a search term.Įxample 5: Search for exact search term using single grep 'Easy CMDB' file1.txt Max 25 Easy CMDB Christchurch If you observe, you got an error stating that, there is no file called CMDB. R grep Easy CMDB file1.txt grep: CMDB: No such file or directory file1.txt:Barbi 25 Eas圜MDB Christchurch file1.txt:Max 25 Easy CMDB Christchurch In this article, we will learn common grep command usage with examples: what is grep command in Linux/ Unix -n (line-number) OPTION with grep. Suppose if you want to search for “ Easy CMDB†in a file, it will be difficult to search with out single quotes. It has many OPTIONS that allows to perform various file search operations. grep -i Nathan file1.txt Nathan 20 Wipro NewyarkĮxample 4: I suggest you always use single quotes for your search term. grep 'Gladiator' movieslist Gladiator Now,using grep to print the below or above lines of the file. If you want specifically Nathan, use caps N in nathan and try once again.Įxample 2: Search for exact word “Nathan†grep Nathan file1.txt Nathan 20 Wipro NewyarkĮxample 3: Search for a word which has either capital or small letters in it, no confusion between nathan or Nathan. Troy Gladiator Robin Hood King Arthur BraveHeart The Last Samurai Normal grep returns. By this type you should know grep is a case sensitive command. To search for Xanadu in all the files in the. This command in its most common form takes two arguments: the pattern to search for and which files to search for. Yeah this is the one command that won the Vim lottery to have the same name as the editor. You dont get any output, as the word nathan is not there. The command to invoke internal grep is :vimgrep.
Output: surendra 31 IBM Chennai Steve 45 BOA London Barbi 25 Eas圜MDB Christchurch Max 25 Easy CMDB Christchurch Nathan 20 Wipro Newyark David 20 ai Newyark Search single file using grepĮxample 1: Search for a word “nathan†in file1.txt grep nathan file1.txt GREP command syntax grep filenameīefore starting grep command examples, I used below file which contain following content. In our next couple of posts we will see what grep can do with the help of regular expressions.
In this post we will see how to use grep in a basic way and then move on some advanced and rarely used options. Grep will become a killer command when we combined it with regular expressions. Grep command can improve a command output by filtering out required information. Grep got its name from ed editor as g/re/p (global / regular expression / print). GREP is a command line search utility or tool to filter the input given to it.