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The egrep command is more forgiving, it allows you to use some unusual characters in your search, including +,?,|,( and ) . While it's possible to set up grep to search for these characters with the help of the backslash, command can be awkward.
egrep is same as ‘grep -E’ or ‘grep –extended-regex’, which uses extended regular expression.
Syntax:
egrep [options] [regexp] [files]
First create the following employee.txt sample file.
100 Thomas Manager Sales $5,000
200 Jason Developer Technology $5,500
300 Sanjay Sysadmin Technology $7,000
400 Nisha Manager Marketing $9,500
500 Randy DBA Technology $6,000
1. Search for Specific Characters
The following example searches for either J, or N, or R.
$ egrep [JNR] employee.txt
200 Jason Developer Technology $5,500
400 Nisha Manager Marketing $9,500
500 Randy DBA Technology $6,000
2. Search for a Range
The following example searches the range 6-9. i.e It searches for 6, or 7, or 8, or 9.
$ egrep [6-9] employee.txt
300 Sanjay Sysadmin Technology $7,000
400 Nisha Manager Marketing $9,500
500 Randy DBA Technology $6,000
3. egrep OR Example
Pipe symbol is used for egrep OR. The following searches for either Marketing or DBA.
$ egrep 'Marketing|DBA' employee.txt
400 Nisha Manager Marketing $9,500
500 Randy DBA Technology $6,000
Note: egrep supports the extended grep characters: +, ?, |, and ( )
The egrep command is more forgiving, it allows you to use some unusual characters in your search, including +,?,|,( and ) . While it's possible to set up grep to search for these characters with the help of the backslash, command can be awkward.
egrep is same as ‘grep -E’ or ‘grep –extended-regex’, which uses extended regular expression.
Syntax:
egrep [options] [regexp] [files]
First create the following employee.txt sample file.
100 Thomas Manager Sales $5,000
200 Jason Developer Technology $5,500
300 Sanjay Sysadmin Technology $7,000
400 Nisha Manager Marketing $9,500
500 Randy DBA Technology $6,000
1. Search for Specific Characters
The following example searches for either J, or N, or R.
$ egrep [JNR] employee.txt
200 Jason Developer Technology $5,500
400 Nisha Manager Marketing $9,500
500 Randy DBA Technology $6,000
2. Search for a Range
The following example searches the range 6-9. i.e It searches for 6, or 7, or 8, or 9.
$ egrep [6-9] employee.txt
300 Sanjay Sysadmin Technology $7,000
400 Nisha Manager Marketing $9,500
500 Randy DBA Technology $6,000
3. egrep OR Example
Pipe symbol is used for egrep OR. The following searches for either Marketing or DBA.
$ egrep 'Marketing|DBA' employee.txt
400 Nisha Manager Marketing $9,500
500 Randy DBA Technology $6,000
Note: egrep supports the extended grep characters: +, ?, |, and ( )
