How do I grep unique strings in Linux?

How do I grep a list of strings?

The syntax is:

1. Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
2. Next use extended regular expressions: egrep ‘pattern1|pattern2’ *. py.
3. Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
4. Another option to grep two strings: grep ‘word1|word2’ input.

How do you find unique words in Linux?

1 Answer. isolates all words from the file that match the Man-[0-9]+ regular expression. That list is then piped through sort to get the sorted list that uniq requires, and then that sorted list is piped through uniq -c to count how often each unique Man- word appears.

How do I grep exact string in Linux?

To Show Lines That Exactly Match a Search String

To print only those lines that completely match the search string, add the -x option. The output shows only the lines with the exact match. If there are any other words or characters in the same line, the grep does not include it in the search results.

How do you find unique UNIX records?

Let us now see the different ways to find the duplicate record.

1. Using sort and uniq: $ sort file | uniq -d Linux. …
2. awk way of fetching duplicate lines: $ awk ‘{a[$0]++}END{for (i in a)if (a[i]>1)print i;}’ file Linux. …
3. Using perl way: …
4. Another perl way: …
5. A shell script to fetch / find duplicate records:

How do I combine two grep commands?

Two possibilities:

1. Group them: { grep ‘substring1’ file1.txt grep ‘substring2’ file2.txt } > outfile.txt. …
2. Use the appending redirection operator >> for the second redirection: grep ‘substring1’ file1.txt > outfile.txt grep ‘substring2’ file2.txt >> outfile.txt.

How do you grep special characters?

To match a character that is special to grep –E, put a backslash ( ) in front of the character. It is usually simpler to use grep –F when you don’t need special pattern matching.

How do you grep only unique lines?

Solution:

1. Using grep and head command. Pipe the output of grep command to head command to get the first line. …
2. Using m option of grep command. The m option can be used to display the number of matching lines. …
3. Using the sed command. We can also use the sed command to print unique occurrence of a pattern. …
4. Using awk command.

How do I grep a file in Linux?

How to use the grep command in Linux

1. Grep Command Syntax: grep [options] PATTERN [FILE…] …
2. Examples of using ‘grep’
3. grep foo /file/name. …
4. grep -i “foo” /file/name. …
5. grep ‘error 123’ /file/name. …
6. grep -r “192.168.1.5” /etc/ …
7. grep -w “foo” /file/name. …
8. egrep -w ‘word1|word2’ /file/name.

How do you count words in Unix?

How to find the total count of a word / string in a file?

1. Using the grep command: $ grep -o ‘Unix’ file | wc -l 4. …
2. tr command: $ tr -s ” ” “n” < file | grep -c Unix 4. …
3. awk solution: $ awk ‘/Unix/{x++}END{print x}’ RS=” ” file 4. …
4. Perl solution: $ perl -ne ‘$x+=s/Unix//g;END{print “$xn”}’ file 4. …
5. Another Perl solution:

What is PS EF command in Linux?

This command is used to find the PID (Process ID, Unique number of the process) of the process. Each process will have the unique number which is called as PID of the process.

What is grep in Linux command?

You use the grep command within a Linux or Unix-based system to perform text searches for a defined criteria of words or strings. grep stands for Globally search for a Regular Expression and Print it out.

How do I use find in Linux?

Basic Examples

1. find . – name thisfile.txt. If you need to know how to find a file in Linux called thisfile. …
2. find /home -name *.jpg. Look for all . jpg files in the /home and directories below it.
3. find . – type f -empty. Look for an empty file inside the current directory.
4. find /home -user randomperson-mtime 6 -iname “.db”

How do I find unique lines in a file?

Find unique lines

1. The file must be sorted first. sort file | uniq -u will output to console for you. – ma77c. …
2. I think the reason sort file | uniq shows all the values 1 time is because it immediately prints the line it encounters the first time, and for the subsequent encounters, it just skips them. – Reeshabh Ranjan.

How do I remove duplicate lines in Unix?

You need to use shell pipes along with the following two Linux command line utilities to sort and remove duplicate text lines:

1. sort command – Sort lines of text files in Linux and Unix-like systems.
2. uniq command – Rport or omit repeated lines on Linux or Unix.

How do you find repeated words in Linux?

Explanation

1. First you can tokenize the words with grep -wo , each word is printed on a singular line.
2. Then you can sort the tokenized words with sort .
3. Finally can find consecutive unique or duplicate words with uniq . 3.1. uniq -c This prints the words and their count.