How assign grep output to variable?

How assign grep output to variable?

How to assign a grep command value to a variable in Linux/Unix

1. VAR=`command-name` VAR=”`grep word /path/to/file`” ## or ## VAR=$(command-name) VAR=”$(grep word /path/to/file)”
2. echo “Today is $(date)” ## or ## echo “Today is `date`”
3. todays=$(date)
4. echo “$todays”
5. myuser=”$(grep ‘^vivek’ /etc/passwd)” echo “$myuser”

How do you use find and grep?

The grep command searches through the file, looking for matches to the pattern specified. To use it type grep , then the pattern we’re searching for and finally the name of the file (or files) we’re searching in. The output is the three lines in the file that contain the letters ‘not’.

How to check the output of grep in Bash?

You need amount of lines – 0, 1, 2, etc. Therefore, count lines in the OUTPUT variable and put this number to the second variable – line_count. We will have two variables in the result. First with grep output, second with amount of lines. Then, check line_count in the case statement and do needed action.

How to redirect grep output to a variable?

For example, I have this pipe: I want to store this result to a variable. I write the following commands: And I get the blank string. What is the problem? Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Provide details and share your research! But avoid …

How to get the return code of grep?

If a $ (…) command substitution is assigned to a variable, $? will get the return code from the last command in the $ (…) . And, of course, you don’t need to refer to $? explicitly; you can do things like if ! OUTPUT=$ (pfiles “$1” 2> /dev/null | grep peername) then exit fi # the rest of the script ︙

How to grep on a variable or grep a string from a variable?

Using the here string allows you to easily grep a string from a variable. Counting the Instances of a String in a Variable. You can use the wc utility to count the number of times a string is found in a variable. To do this, you must first tell grep to only show the matching characters with the -o (–only-matching) option. Then you can pipe it