bash: question about grep
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Newsgroups: comp.unix.shell
From:
"lihao0... @gmail.com" <lihao0... @gmail.com> Date: Mon, 21 Jul 2008 11:21:05 -0700 (PDT)
Local: Mon, Jul 21 2008 2:21 pm
Subject: bash: question about grep
For the following TAB-delimited records, I want to count number of ===== file.txt ======
I tried:
grep -c -- "-1\t" file.txt
which is not working. I know I can do it with awk, like:
awk -F'\t' '$2==-1{t++}END{print t}' file.txt
But I would rather find a `grep` solution, any thought?? many thanks,
lihao
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Newsgroups: comp.unix.shell
From:
Stephane CHAZELAS <stephane_chaze... @yahoo.fr> Date: Mon, 21 Jul 2008 18:48:37 +0000 (UTC)
Local: Mon, Jul 21 2008 2:48 pm
Subject: Re: bash: question about grep
2008-07-21, 11:21(-07), lihao0... @gmail.com:
> For the following TAB-delimited records, I want to count number of
> records with column-2 == -1 (should be 2)
> ===== file.txt ======
> I tried:
> grep -c -- "-1\t" file.txt
$'...' is ksh93/zsh/bash specific.
> which is not working. I know I can do it with awk, like:
> awk -F'\t' '$2==-1{t++}END{print t}' file.txt
> But I would rather find a `grep` solution, any thought?? many thanks,
Why, the awk solution looks a lot neater to me as closer to your
Another one:
cut -f2 < file.txt | grep -cFxe -1
--
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Newsgroups: comp.unix.shell
From:
"lihao0... @gmail.com" <lihao0... @gmail.com> Date: Mon, 21 Jul 2008 12:00:40 -0700 (PDT)
Local: Mon, Jul 21 2008 3:00 pm
Subject: Re: bash: question about grep
On Jul 21, 2:48 pm, Stephane CHAZELAS <stephane_chaze... @yahoo.fr>
> 2008-07-21, 11:21(-07), lihao0
... @gmail.com:
> > For the following TAB-delimited records, I want to count number of
> > ===== file.txt ======
> > I tried:
> > grep -c -- "-1\t" file.txt
> grep -c -- $'-1\t' file.txt
> $'...' is ksh93/zsh/bash specific.
> > which is not working. I know I can do it with awk, like:
> > awk -F'\t' '$2==-1{t++}END{print t}' file.txt
> > But I would rather find a `grep` solution, any thought?? many thanks,
> [...]
> Why, the awk solution looks a lot neater to me as closer to your
> Another one:
> cut -f2 < file.txt | grep -cFxe -1
thanks again,
> --
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