Is There An Rgrep Alias For Mac

Question: Can you explain how to use OR, AND and NOT operators in Unix grep command with some examples?Answer: In grep, we have options equivalent to OR and NOT operators. There is no grep AND opearator. But, you can simulate AND using patterns. The examples mentioned below will help you to understand how to use OR, AND and NOT in Linux grep command.The following employee.txt file is used in the following examples. $ cat employee.txt100 Thomas Manager Sales $5,000200 Jason Developer Technology $5,500300 Raj Sysadmin Technology $7,000400 Nisha Manager Marketing $9,500500 Randy Manager Sales $6,000You already knew that grep is extremely powerful based on these. Grep OR OperatorUse any one of the following 4 methods for grep OR. I prefer method number 3 mentioned below for grep OR operator.

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Grep OR Using If you use the grep command without any option, you need to use to separate multiple patterns for the or condition. Grep 'pattern1 pattern2' filenameFor example, grep either Tech or Sales from the employee.txt file. Without the back slash in front of the pipe, the following will not work. $ grep 'Tech Sales' employee.txt100 Thomas Manager Sales $5,000200 Jason Developer Technology $5,500300 Raj Sysadmin Technology $7,000500 Randy Manager Sales $6,000 2. Grep OR Using -Egrep -E option is for extended regexp. If you use the grep command with -E option, you just need to use to separate multiple patterns for the or condition. Grep -E 'pattern1 pattern2' filenameFor example, grep either Tech or Sales from the employee.txt file.

Tennekes and lumley solution manual. Just use the to separate multiple OR patterns. $ grep -E 'Tech Sales' employee.txt100 Thomas Manager Sales $5,000200 Jason Developer Technology $5,500300 Raj Sysadmin Technology $7,000500 Randy Manager Sales $6,000 3. Grep OR Using egrepegrep is exactly same as ‘grep -E’.

So, use egrep (without any option) and separate multiple patterns for the or condition. Egrep 'pattern1 pattern2' filenameFor example, grep either Tech or Sales from the employee.txt file.

Just use the to separate multiple OR patterns. $ egrep 'Tech Sales' employee.txt100 Thomas Manager Sales $5,000200 Jason Developer Technology $5,500300 Raj Sysadmin Technology $7,000500 Randy Manager Sales $6,000 4. Grep OR Using grep -eUsing grep -e option you can pass only one parameter. Use multiple -e option in a single command to use multiple patterns for the or condition. Grep -e pattern1 -e pattern2 filenameFor example, grep either Tech or Sales from the employee.txt file.

Use multiple -e option with grep for the multiple OR patterns. $ grep -e Tech -e Sales employee.txt100 Thomas Manager Sales $5,000200 Jason Developer Technology $5,500300 Raj Sysadmin Technology $7,000500 Randy Manager Sales $6,000 Grep AND 5. Grep AND using -E ‘pattern1.pattern2’There is no AND operator in grep.

But, you can simulate AND using grep -E option. Grep -E 'pattern1.pattern2' filenamegrep -E 'pattern1.pattern2 pattern2.pattern1' filenameThe following example will grep all the lines that contain both “Dev” and “Tech” in it (in the same order). $ grep -E 'Dev.Tech' employee.txt200 Jason Developer Technology $5,500The following example will grep all the lines that contain both “Manager” and “Sales” in it (in any order). $ grep -E 'Manager.Sales Sales.Manager' employee.txtNote: Using is very powerful if you know how to use it effectively. Grep AND using Multiple grep commandYou can also use multiple grep command separated by pipe to simulate AND scenario. Grep -E 'pattern1' filename grep -E 'pattern2'The following example will grep all the lines that contain both “Manager” and “Sales” in the same line.

$ grep Manager employee.txt grep Sales100 Thomas Manager Sales $5,000500 Randy Manager Sales $6,000 Grep NOT 7. Grep NOT using grep -vUsing grep -v you can simulate the NOT conditions.v option is for invert match. I.e It matches all the lines except the given pattern. Grep -v 'pattern1' filenameFor example, display all the lines except those that contains the keyword “Sales”.

$ grep -v Sales employee.txt200 Jason Developer Technology $5,500300 Raj Sysadmin Technology $7,000400 Nisha Manager Marketing $9,500You can also combine NOT with other operator to get some powerful combinations.For example, the following will display either Manager or Developer (bot ignore Sales). $ egrep 'Manager Developer' employee.txt grep -v Sales200 Jason Developer Technology $5,500400 Nisha Manager Marketing $9,500. I am looking for a multiple grep with NOT and AND conditions. I have a directory with with txt files and some csv files which have the date included in the filename. I want to delete the csv files that do not include today’s date. So I am trying the code below in bash#!/bin/bashnow=$(date “+%m-%d-%Y”)dir=”/var/tmp/”for f in “$dir”/.; dols -1 grep -v.$now.

grep.csv. xargs rm -fdoneThis is not deleting anything. If I take out the grep.csv. operator then it deletes the text files.

Only the CSV files have dates on them, the text files don’t. Please advise.