Question on grepping multiple words in a line

I'm trying have grep both the words 'cdalten' and "bash'. The closest I got was being able to grep either one of them like below.

[cdalten@localhost ~]$ w | grep -E 'cdalten|bash'

Quote:

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cdalten pts/1 :0.0 05Apr09 6days 0.36s 0.36s bash
cdalten pts/2 :0.0 05Apr09 5days 2.24s 1.88s python
cdalten pts/3 :0.0 16:11 7:55 0.64s 0.13s python
cdalten pts/4 :0.0 17:05 0.00s 0.49s 0.03s w
cdalten pts/5 :0.0 Thu19 32:14m 0.89s 0.89s bash

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What's the magical regex expression that I pass to grep so that I get the following instead

Quote:

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cdalten pts/1 :0.0 05Apr09 6days 0.36s 0.36s bash
cdalten pts/5 :0.0 Thu19 32:14m 0.89s 0.89s bash

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Code:

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"[cdalten|bash]"

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?

I generally do this by running "grep first | grep second", but I'm generally lazy when it comes to learning advanced expressions for tools that can easily be done by typing a bit more [I generally use this mostly when I find that the first grep got me far to much, and it's often easier to just add a "| grep somethingelse" onto the existing line, than it is to reform the expression (and you can use "grep -v someword" to only accept lines that do NOT contain someword - e.g. list all processes NOT bash: "w | grep cdalten | grep -v bash").

--
Mats

I think he meant "A OR B" not "A AND B".

[edit]Oh nvm, I think you are right.[/edit]

Quote:

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Originally Posted by cyberfish

I think he meant "A OR B" not "A AND B".

[edit]Oh nvm, I think you are right.[/edit]

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Yeah, I want grep to return if both 'A AND B' are true

Code:

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cat txt | grep 'bash' | grep 'cdalten'

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There is no advantage to using a regular expression with this, but if you want to, there's always

Code:

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cat txt | perl -ne 'if ((/bash/) && (/cdalten/)) {print $_}'

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This one works too but is sensitive to whitespace at the end of line:

Code:

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cat txt | perl -ne 'if (/^cdalten.*bash$/) {print $_}'

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Regular languages support conjunction, but I've never seen it in any regex syntax I've used. I do the same thing matsp does -- two greps.