grep

[web9452]

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grep -n '\\' tom.c works and grep -n 'stdio' tom.c works. Can I combine these two grep statements into one grep statement. I tried various ,* combinations, The computer didn't complain but it didn't offer any output either. don't know how to get a copy tom.c to you.

 

[aragats]

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don't know how to get a copy tom.c to you.

by attaching it here?

 

[Kai Burghardt]

use | for or, what do you use for and??

A logical and is achieved by piping the output back as input.​

foo | grep 'firstExpression' | grep 'secondExpression'

Should you instruct grep(1) to print additional info (after/before match context, line numbers, file names, you name it), you need to form an ersatz expression, one like covacat already suggested.​

foo | grep -n '(firstExpression.*secondExpression|secondExpression.*firstExpression)'

Evidently this does not work isn’t straightforward if the expression may intersect each other, if a string can be part of the first and second expression at the same time.​

 

[Erichans]

grep -n '\\' tom.c works and grep -n 'stdio' tom.c works. Can I combine these two grep statements into one grep statement. I tried various ,* combinations

Attach tom.c (as aragats requested) and tell what you would like to have matched.

don't know how to get a copy tom.c to you.

When writing a message click on the "Attach files" button (with the paperclip in front of it) at the bottom of your message.

 

[chief]

You can use extended regex
grep -n -E '\\|stdio' tom.c


Or try grep -n -e '\\' -e 'stdio' tom.c

 

[web9452]

i attached tom.txt

 

[Erichans]

chief allready gave the answer.

What was very helpful to me:

1. Regular Expressions
2. UNIX SHELL Quote Tutorial
3. Sed - An Introduction and Tutorial by Bruce Barnett
4. Sh - the POSIX Shell

If you're going to create & practice more with regular expressions, 1-3 sort of go together. If your shell is sh(1) or you choose to script in sh(1), then that one will be practical too.

Getting confident with regular expression can take some time; I'm still learning.

 

[aragats]

grep -n '\\' tom.c works and grep -n 'stdio' tom.c works.
Can I combine these two grep statements into one grep statement. I tried various ,* combinations, The computer didn't complain but it didn't offer any output either.
....
i attached tom.txt

Works here with "or":

% grep '\\\|stdio' tom.c
#include<stdio.h>
 printf("%f\n",func(10.0));

% grep -E '\\|stdio' tom.c 
#include<stdio.h>
 printf("%f\n",func(10.0));

 

[web9452]

chief allready gave the answer.

What was very helpful to me:

1. Regular Expressions
2. UNIX SHELL Quote Tutorial
3. Sed - An Introduction and Tutorial by Bruce Barnett
4. Sh - the POSIX Shell

If you're going to create & practice more with rugular expressions, 1-3 sort of go together. If your shell is sh(1) or you choose to script in sh(1), then that one will be practical too.

Getting confident with regular expression can take some time; I'm still learning.

thanks.

 

[web9452]

: > fn
what other things can you use instead of : in this command?