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Word count of lines ending with certain word

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Old 08-29-2009
warlock129 warlock129 is offline
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Word count of lines ending with certain word

Hi all, I am trying to write a command that can help me count the number of lines in the /etc/passwd file ending in bash.

I have read through other threads but am yet to find one indicating how to locate a specifc word at the end of a line. I know i will need to use the wc command but when i attempt to combine this with grep it seems to do nothing at all. Below is the command i am entering:

cat /etc/passwd | wc | grep bash

If anyone can help me correct this and indicate where i am going wrong i'd be most grateful.
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Old 08-29-2009
sigtor77 sigtor77 is offline
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try this:

cat /etc/passwd | grep "bash" | wc

or

cat /etc/passwd | grep "bash" | wc -l

if you just want the count.
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Old 08-29-2009
warlock129 warlock129 is offline
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Thanks for that but i have one more question if within /etc/passwd i wanted to write a command to replace each instance of bin/bash from every line with bin/csh without manually editing the file how would i do that?
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Old 08-29-2009
sigtor77 sigtor77 is offline
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use the stream editor, sed.

sed -i 's/bin\/bash/bin\/csh/g' /etc/passwd

the back slashes are escape characters for the front slashes. The g reperesents 'global,' and will change every instance, not just the first occurance on each line.

Hopefully this works.
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Old 08-29-2009
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durden_tyler durden_tyler is offline Forum Advisor  
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Quote:
Originally Posted by warlock129 View Post
...
if within /etc/passwd i wanted to write a command to replace each instance of bin/bash from every line with bin/csh without manually editing the file how would i do that?

Code:
$ 
$ cat f1
The first line.
This line has /bin/bash in it.
The third line.
This line has /bin/bash in it, twice => /bin/bash.
The fifth line.
And /bin/bash here and here /bin/bash and here /bin/bash
$ 
$ perl -pi.backup -e 's#/bin/bash#/bin/csh#g' f1
$ 
$ cat f1
The first line.
This line has /bin/csh in it.
The third line.
This line has /bin/csh in it, twice => /bin/csh.
The fifth line.
And /bin/csh here and here /bin/csh and here /bin/csh
$ 
$ cat f1.backup
The first line.
This line has /bin/bash in it.
The third line.
This line has /bin/bash in it, twice => /bin/bash.
The fifth line.
And /bin/bash here and here /bin/bash and here /bin/bash
$ 
$

tyler_durden
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Old 08-29-2009
EAGL€ EAGL€ is offline
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Warlock im not good at shell but let me help you as far as i can. Use SED for this and the command should be something like below:


Code:
sed 's/\/bin\/bash/\/bin\/csh/g' /etc/passwd

regards
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Old 08-29-2009
danmero danmero is offline Forum Advisor  
 
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Quote:
Originally Posted by warlock129 View Post
I am trying to write a command that can help me count the number of lines in the /etc/passwd file ending in bash.

Code:
awk -F\/ '$NF=="bash"{a++}END{print a}' /etc/passwd

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