Linux: How can i grep text from string to string

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How can I get text using grep command txt that seats between two strings?

for example:

<--string 1-->
the text i need
<--string 2-->

the "the text i need" between the two tags is dynamic, therefor i need a command that will output text from "<--string 1-->" to "<--string 2-->"

Supposing "the text I need" is just one line, you should check that both string1 and string2 appear (Alex's solution only checks one thing).

A better solution would be:

grep -A 2 "string 1" $file | tail -2 | grep -B 1 "string 2" | head -1

How to use grep command in UNIX / Linux {With Examples}, When –w is omitted, grep displays the search pattern even if it is a substring of another word. If you would like to search for multiple strings and� The grep command is primarily used to search text or search any given file for lines containing a match to the supplied words/strings. By default, grep displays the matching lines, and it may be used to search for lines of text matching one/many regular expressions in a fuss-free, and it outputs only the matching lines.

if you know that "the text i need" is always above or always below string 1 or string 2, you can use grep -A 1 "string 1" $file | tail -1 or grep -B 1 "string 2" $file | head -1

Grep Command in Linux (Find Text in Files), For example, to display all the lines containing the string bash from the /etc/ passwd file, you would run the following� Grep is a powerful utility available by default on UNIX-based systems. The name stands for Global Regular Expression Print. By using the grep command, you can customize how the tool searches for a pattern or multiple patterns in this case. You can grep multiple strings in different files and directories.

we need to know what is the line number for string1 and string2 we can use grep -n for that then using head and tail we can get lines between string1 and string2 for example:

<--string 1-->
the text i need
<--string 2-->


start=$(cat file | grep -n <--string 1--> | grep -Eo [0-9]+)
finish=$cat file | grep -n <--string 2-->) | grep -Eo [0-9]+)
res=$((finish-start))
result=$(cat file | head -$start | tail -$res)

It is a little bit hacky, but it worked for me.

How to use grep to search for strings in files on the shell, The grep command is primarily used to search text or search any given file for lines In the first example, I will search for the user "tom" in the Linux passwd file . This will perform a recursive search operation trough files for the string� There are many tools we can use in *nix-based systems to find and manipulate text. In this article, we will cover the grep command to search for patterns, whether found in files or coming from a stream (a file or input comping from a pipe, or |).

This might work for you:

grep -A2 "<--string 1-->" file | grep -v "<--string 1-->\|<--string 2-->"

or

grep -A1 "<--string 1-->" file | grep -v "<--string 1-->"

or in a single process:

sed '/<--string 1-->/,/<--string 2-->/!d;//d' file

or:

awk '/<--string 2-->/{p=0};p;/<--string 1-->/{p=1}' file

Tutorial: Find Strings in Text Files Using Grep with Regular , The grep Linux/Unix command line utility is one of most popular tools for In this article, we show you to run advance string searching using� grep "deiauk" file.txt I get this result: deiauk 1611516 afsdf 765 deiauk1 sdfsfdsfs 1561 51 deiauk2 115151 5454 4 but I only need this: deiauk 1611516 afsdf 765 deiauk 1611516 afsdf ddfgfgd I know there's a -w option, but then my string has to mach whole line.

I hope this helps you.

DATA=$(cat /tmp/file)
STARTVAR=$(echo "$DATA" | grep -n '<--string 1-->' | grep -Eo [0-9]+)
ENDVAR=$(echo "$DATA" | grep -n '<--string 2-->' | grep -Eo [0-9]+)
CALC=$((($ENDVAR - $STARTVAR) - 1))
result=$(echo "$DATA" | grep -A $CALC '<--string 1-->')
echo "$result"

Replace the CALC=$((($ENDVAR - $STARTVAR) - 1)) line with CALC=$(($ENDVAR - $STARTVAR)) if you want to include '<--string 2-->' in output

How to Grep for Text in Files, Practical examples for using grep to find strings in text files and streams. Grep is a command-line utility that can search and filter text using a common provided in nearly all distributions of Linux-based operating systems. @alya, see edit. It works for me on your sample. As stated, the grep one will not work on all systems, as it uses GNU extensions (so will only work on systems where grep is the GNU one (see grep --version) or have copied those extensions from GNU grep), and also the PCREs are relatively recent (\K was added only a few years ago).

On a Linux system, the need to search one or multiple files for a specific text string can arise quite often.On the command line, the grep command has this function covered very well, but you'll need to know the basics of how to use it.

The egrep command belongs to the family of the grep command which is used for pattern searching in Linux. If you have used the grep command, egrep works the same as grep -E (grep Extended regex’) does. Egrep scans a specific file, line to line, and prints the line (s) that contain the search string/regular expression.

Comments
  • will "the text i need" be always one line or it could be more?
  • you cannot always assume the "the text I needed" is one line
  • the text between two trings is dynamic!