mjhjmtu

I am trying to print all the lines from a file that has the same characters of the matching pattern.
Here is my pattern -

CurrentPrincipal[MRC]
CurrentPrincipalLegalEventAssociation

In the file I have the lines like the below ones

823,agg.listgroup,CurrentPrincipal[MRC],CompanyElementDefinition
d4f170,atom.list,CurrentPrincipal[MRC][Type][*],CompanyElementDefinition
1097,agg.listgroup,CurrentPrincipalLegalEventAssociation,CompanyElementDefinition
c755ad,atom.list,CurrentPrincipal[LegalEventAssociation][Type][*],CompanyElementDefinition
8798c3,atom.list,CurrentPrincipal[MailingAddressStreetLine1][*],CompanyElementDefinition

I am iterating my pattern and printing its matching lines from the file. What I need is, when I iterate my pattern CurrentPrincipal[MRC] I should get only its matching line

d4f170,atom.list,CurrentPrincipal[MRC][Type][*],CompanyElementDefinition

and when the pattern is CurrentPrincipalLegalEventAssociation I should get only

c755ad,atom.list,CurrentPrincipal[LegalEventAssociation][Type][*],CompanyElementDefinition

My requirement is to ignore the [ ] from the line while matching pattern.
I have tried my best to put my issue affront. Do let me know if anything else is needed from me.
Thanks in advance.

You appear to want the [ and ] characters to be treated literally rather than as indicating a character range. You can do that by escaping them:

grep 'CurrentPrincipal[LegalEventAssociation]' file

Ex. given:

$ cat file
823,agg.listgroup,CurrentPrincipal[MRC],CompanyElementDefinition
d4f170,atom.list,CurrentPrincipal[MRC][Type][*],CompanyElementDefinition
1097,agg.listgroup,CurrentPrincipalLegalEventAssociation,CompanyElementDefinition
c755ad,atom.list,CurrentPrincipal[LegalEventAssociation][Type][*],CompanyElementDefinition
8798c3,atom.list,CurrentPrincipal[MailingAddressStreetLine1][*],CompanyElementDefinition

then

$ grep 'CurrentPrincipal[LegalEventAssociation]' file
c755ad,atom.list,CurrentPrincipal[LegalEventAssociation][Type][*],CompanyElementDefinition

Alternatively use the -F or --fixed-strings option to tell grep to treat all characters literally:

$ grep -F 'CurrentPrincipal[LegalEventAssociation]' file
c755ad,atom.list,CurrentPrincipal[LegalEventAssociation][Type][*],CompanyElementDefinition

grep seems to do what you want.

grep 'word' filename

Will print every line in the file 'filename' that contains 'word'.

Using the following, the file output appears in next line in the file after pattern search line.

sed -n '/CurrentPrincipal[MRC]/p' filename | sed -n '2p' 

Output

d4f170,atom.list,CurrentPrincipal[MRC][Type][*],CompanyElementDefinition 

sed -n '/CurrentPrincipalLegalEventAssociation/,+1p' l.txt | sed -n '2p'

Output

c755ad,atom.list,CurrentPrincipal[LegalEventAssociation][Type][*],CompanyElementDefinition