egrep
egrep is the extended version of grep : Extended Global Regular
Expressions Print.
Syntax:
egrep text/char/letter fileName
Let's take a file file1 with
below contents:
Summer is Beautiful.
A person should have beautiful mind.
Something is better than nothing.
We have 12 months in a year.
hello world !
New year occurs in January.
He fulfilled his wish.
1. egrep ll file1 ENTER --- search
lines having "ll" from the file.
Output:
hello world !
He fulfilled his wish.
OR
grep -E ll file1 ENTER
Output:
hello world !
He fulfilled his wish.
2. egrep [abc] file1 --- returns lines containing either a or b or c
Output:
Summer is Beautiful.
A person should have beautiful mind.
Something is better than nothing.
We have 12 months in a year.
New year occurs in January.
3. egrep [ABC] file1 --- lines
containing letter A or B or C
egrep is case sensitive , above command returns below output:
Output:
Summer is Beautiful.
A person should have beautiful mind.
4. egrep [A-H] file1 --- lines
containing the letters A or B or C or D
or E or F or H
Output:
Summer is Beautiful.
A person should have beautiful mind.
He fulfilled his wish.
Let's have another file file2
as below:
January is the 1st month
February is the second month.
A week has 7 days.
There are four seasons.
12 months in a year.
He works 24/7
We have 2 eyes to see.
We have two hands for hard work.
5. egrep [1-4] file2 --- lines having the number 1 or 2 or 3 or 4
Output:
January is the 1st month
12 months in a year.
He works 24/7
We have 2 eyes to see.
6. egrep 'week|month|year' file2
--- lines having the words "
week " or "month" or "year"
Output:
January is the 1st month
February is the second month.
A week has 7 days.
12 months in a year.
7. egrep '^January|^A|^T' file2 ---
lines starting with the word "January" or letter "A" or
letter "T"
Output:
January is the 1st month
A week has 7 days.
There are four seasons.
Let's take a new file file3
January is the 1st month
February is the 2nd month.
1 week of rest
this is season 1
12 months in a year.
He works 24/7
We established in 1999
be Honest
5 boys are playing outside
8. egrep '^(1|F)' file3 --- lines
starting with number "1" or letter "F"
Output:
February is the 2nd month.
1 week of rest
12 months in a year.
9. egrep '[1-9]$' file3 --- lines
ending with number 1 to 9.
Output:
this is season 1
He works 24/7
We established in 1999
10. egrep '[a-zA-Z]$' file3 ---
lines ending with alphabets lower case or upper case.
Output:
January is the 1st month
1 week of rest
be Honest
5 boys are playing outside
11. egrep '^1|t$' file3 --- lines
which start with 1 or ends with "t" .
Output:
1 week of rest
12 months in a year.
be Honest
12. egrep -c 'month|week' file3 ---
count number of lines meeting the condition
Output:
4
13. egrep -i 'january|honesT' file3
--- use "i" to ignore the case sensitivity.
Output:
January is the 1st month
be Honest
To search from more than one
file
Let's take a file file1 with
below contents:
Summer is Beautiful.
A person should have beautiful mind.
Something is better than nothing.
We have 12 months in a year.
hello world !
New year occurs in January.
He fulfilled his wish.
Let's have another file file2
as below:
January is the 1st month
February is the second month.
A week has 7 days.
There are four seasons.
12 months in a year.
He works 24/7
We have 2 eyes to see.
We have two hands for hard work.
Let's take a new file file3
January is the 1st month
February is the 2nd month.
1 week of rest
this is season 1
12 months in a year.
He works 24/7
We established in 1999
be Honest
5 boys are playing outside
14. egrep month file1 file2
Output:
file1:We have 12 months in a year.
file2:January is the 1st month
file2:February is the second month.
file2:12 months in a year.
15. egrep month file*
Output:
egrep month file*
file1:We have 12 months in a year.
file2:January is the 1st month
file2:February is the second month.
file2:12 months in a year.
file3:January is the 1st month
file3:February is the 2nd month.
file3:12 months in a year.
Print output with line number as
well
16. egrep -n month file*
Output:
file1:4:We have 12 months in a year.
file2:1:January is the 1st month
file2:2:February is the second month.
file2:5:12 months in a year.
file3:1:January is the 1st month
file3:2:February is the 2nd month.
file3:5:12 months in a year.
17. egrep -n 'week|month' file1 file2
Output:
file1:4:We have 12 months in a year.
file2:1:January is the 1st month
file2:2:February is the second month.
file2:3:A week has 7 days.
file2:5:12 months in a year.
18. egrep -v month file1 --- returns
output with out the line having the given word.
Output:
Summer is Beautiful.
A person should have beautiful mind.
Something is better than nothing.
hello world !
New year occurs in January.
He fulfilled his wish.
19. egrep -v 'month|week|year' file1 file2
Output:
file1:Summer is Beautiful.
file1:A person should have beautiful mind.
file1:Something is better than nothing.
file1:hello world !
file1:He fulfilled his wish.
file2:There are four seasons.
file2:He works 24/7
file2:We have 2 eyes to see.
file2:We have two hands for hard work.
20. egrep -nv ^S file1 --- returns lines with line numbers not starting with "S "
2:A person should have beautiful mind.
4:We have 12 months in a year.
5:hello world !
6:New year occurs in January.
7:He fulfilled his wish.
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