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Old 02-20-2013, 05:45 AM   #1
nitya
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bash to print words/lines horizontally


Hi All,
I have a test file with below entries
Code:
$ cat /tmp/test 
RedHat
Cent
Fedora
Suse
Ubuntu
Now how can I print these entries horizontally i.e I am expecting the output to be as
Code:
RedHat Cent Fedora Suse Ubuntu
Thanks in advance for your kind help.
 
Old 02-20-2013, 05:54 AM   #2
druuna
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Using tr:
Code:
 cat infile | tr "\n" " "
Using awk:
Code:
awk 'BEGIN{ ORS=" " }{ print }' infile
There are probably other ways as well.
 
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Old 02-20-2013, 06:03 AM   #3
millgates
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pure bash:

Code:
foo="$(<infile)"
echo "${foo//$'\n'/ }"
or

Code:
<infile mapfile -t array
echo "${array[@]}"
Of course, there's also Perl, sed and many others.
 
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Old 02-20-2013, 06:37 AM   #4
nitya
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Thank you both, worked as expected. But druuna both of your commands output are in the same line where will be "user@hostname:~$", it is okay I can cut and paste the output.
Once again thanks a lot druuna and millgates.

Last edited by nitya; 02-20-2013 at 06:43 AM.
 
Old 02-20-2013, 07:36 AM   #5
millgates
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Quote:
Originally Posted by nitya View Post
both of your commands output are in the same line where will be "user@hostname:~$"
That's because the first example just replaces all newlines with spaces, including the trailing one. So there's no newline at the end of output and the bash prompt ends up on the same line. The awk example reads the file line by line and outputs them delimited by spaces. Again, no newline at the end of output. My examples work in a similar way, but I use echo to print the result, which automatically appends a newline to whatever it prints (this can be overriden by the -n switch). If you want those trailing \ns to be there, you can print them yourself:

Code:
cat infile | tr "\n" " " && echo
and

Code:
awk 'BEGIN{ ORS=" " }{ print }END{ print "\n"}' infile
or

Code:
awk 'BEGIN{ ORS=" " }{ print }' infile && echo
But it depends on what you want to do with the output. Do you want to use it in a script? Put it in a file?
 
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Old 02-20-2013, 08:33 AM   #6
RaviTezu
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Adding to druuna post.
Quote:
cat infile | tr "\n" " " | grep -v @
Will work. i have ignored "user@hostname:~$" using grep command. :P
 
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Old 02-20-2013, 10:58 AM   #7
grail
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Code:
paste -sd' ' file
 
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Old 02-20-2013, 11:10 AM   #8
colucix
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Code:
echo $(<file)
 
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Old 02-21-2013, 03:58 AM   #9
nitya
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Thank you all for giving lot of ways to achieve this.
Code:
@millgates
foo="$(<infile)"
echo "${foo//$'\n'/ }"

<infile mapfile -t array
echo "${array[@]}"

cat infile | tr "\n" " " && echo

awk 'BEGIN{ ORS=" " }{ print }' /tmp/test && echo

@RaviTezu
cat infile | tr "\n" " " | grep -v @

@grail
paste -sd' ' file

@colucix
echo $(<file)
All above commands worked great. This thread helped me a lot to know about different commands.
Once again thank you all.

Last edited by nitya; 02-21-2013 at 03:59 AM.
 
Old 02-21-2013, 05:51 AM   #10
shivaa
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One more way:
Code:
~$ for word in $(cat /tmp/test); do echo -n "$word "; done; echo
 
Old 02-21-2013, 06:11 AM   #11
millgates
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Quote:
Originally Posted by shivaa View Post
One more way:
Code:
~$ for word in $(cat /tmp/test); do echo -n "$word "; done; echo
In this case it will work, but keep in mind that reading files with for like this is generally a bad idea.

Code:
~$ while read word; do echo -n "$word"; done < /tmp/test; echo
might be a bit better.
 
Old 02-21-2013, 06:19 AM   #12
shivaa
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Quote:
Originally Posted by millgates;
In this case it will work, but keep in mind that reading files with for like this is generally a bad idea.
Oh yes, you're right.. how can I forget David the H's lession on use while instead of for.

@Everyone:
How can I read a file (data stream, variable) line-by-line (and/or field-by-field)? (Link)
And
Why you don't read lines with "for" (Link)
 
Old 02-21-2013, 06:32 AM   #13
whizje
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Code:
xargs echo < file
 
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Old 02-21-2013, 06:32 AM   #14
whizje
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Code:
xargs echo < file
 
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