egrep issues

[Theadmin77]

Ok , i m playing with egrep command and i am a little stuck in these (i have researched google and MAN pages already ):

1.i need to search files using EGREP in the /var/log directory that contain the word 'su' (case sensitive) at EITHER the END of a line OR the beginning of the line. Add two lines of context AFTER each keyword found. (i can accomplish everything BUT the END of the line with the following command:).

egrep –A 2 ‘^(su)\b’ /var/log/*

2.. Search all files directly under ~ that contain either the word 'whether' or 'wither.' Make sure that each word found is prefaced by the number of the line on which it occurs, and output your results to a file called 'my.search.' (with the following command i get WITHER but no WHETER).

Egrep –n ‘w[hei]ther’~/* > my.search

3.. Find all DIRECTORIES under the current directory which include 'tmp' in its name. (I tried the following command with no luck : )
Find . –name tmp


Any idea anyone in what i am doing wrong here ?

Thank you for your assistance .

[Motoma]

Ok , i m playing with egrep command and i am a little stuck in these (i have researched google and MAN pages already ):

1.i need to search files using EGREP in the /var/log directory that contain the word 'su' (case sensitive) at EITHER the END of a line OR the beginning of the line. Add two lines of context AFTER each keyword found. (i can accomplish everything BUT the END of the line with the following command:).

egrep –A 2 ‘^(su)\b’ /var/log/*

2.. Search all files directly under ~ that contain either the word 'whether' or 'wither.' Make sure that each word found is prefaced by the number of the line on which it occurs, and output your results to a file called 'my.search.' (with the following command i get WITHER but no WHETER).

Egrep –n ‘w[hei]ther’~/* > my.search

3.. Find all DIRECTORIES under the current directory which include 'tmp' in its name. (I tried the following command with no luck : )
Find . –name tmp


Any idea anyone in what i am doing wrong here ?

Thank you for your assistance .

I am really bad with regular expressions, but here is a great reference site.

The last one might be as simple as "find . | grep tmp" or "find . -wholename tmp"

[Colloid Snake]

Ok , i m playing with egrep command and i am a little stuck in these (i have researched google and MAN pages already ):

1.i need to search files using EGREP in the /var/log directory that contain the word 'su' (case sensitive) at EITHER the END of a line OR the beginning of the line. Add two lines of context AFTER each keyword found. (i can accomplish everything BUT the END of the line with the following command:).

egrep –A 2 ‘^(su)\b’ /var/log/*

If you're looking for something at the end of the line, you use '$', but the ^ and $ are best used separately. I think you're going to need the * operator (which represents either zero or more of an instance), and parentheses around the ^ and $ markers. Also, the .* is helpful for getting between text.

2.. Search all files directly under ~ that contain either the word 'whether' or 'wither.' Make sure that each word found is prefaced by the number of the line on which it occurs, and output your results to a file called 'my.search.' (with the following command i get WITHER but no WHETER).

Egrep –n ‘w[hei]ther’~/* > my.search

This searches specifically for 'wheither'. You should look into the | (pipe) operator.

3.. Find all DIRECTORIES under the current directory which include 'tmp' in its name. (I tried the following command with no luck : )
Find . –name tmp


Any idea anyone in what i am doing wrong here ?

Thank you for your assistance .

That once again, searches for anything labeled 'tmp', again I think you need the wildcard operator '*' (if you're looking specifically for the regex - Motoma's way is definitely easier).