Need to remove trailing spaces

[Adam Noble]

Hi,

I am just trying to set a variable to be the model type of the system using the following:-

MODEL=`model | awk -F "[/]" '{print $3}'`

The problem I have is that on certain systems such as an RP4440 that actually produces a variable with 2 trailing spaces after it. I can't really use cut as the model strings vary. How can I simply remove the trailing spaces.

Thanks

[Pete Randall]

From "Handy one-liners for SED" (attached):

# delete trailing whitespace (spaces, tabs) from end of each line
sed 's/[ \t]*$//' # '\t'=tab (see note at end of file)


Pete

[Ivan Krastev]

Same in awk:

# delete leading whitespace (spaces, tabs) from front of each line
# aligns all text flush left
awk '{sub(/^[ \t]+/, ""); print}'

# delete trailing whitespace (spaces, tabs) from end of each line
awk '{sub(/[ \t]+$/, "");print}'

# delete BOTH leading and trailing whitespace from each line
awk '{gsub(/^[ \t]+|[ \t]+$/,"");print}'
awk '{$1=$1;print}' # also removes extra space between fields


regards,
ivan

[James R. Ferguson · Accepted solution]

Hi Adam:

# MODEL=`model | awk -F "/" '{gsub(/ /,"");print $3}'`

Regards!

..JRF...

[Adam Noble]

Thanks All much appreciated.

[Arturo Galbiati]

Hi Adam,
it's strange. I run same command and the result on my HPux11i it's fine:
%MODEL=`model | awk -F "[/]" '{print $3}'`
%echo "#$MODEL#"
#rp7420#

I also simulate the trouble using a var with spaces at the end but the result it's fine as well:

%x="9000/800/rp7420 "
%echo "#$x#"
#9000/800/rp7420 #
%MODEL=`echo $x | awk -F "[/]" '{print $3}'`
%echo "#$MODEL#"
#rp7420#

HTH,
Art

[Dennis Handly]

>Art: I run same command and the result on my 11i it's fine:

Send the output of model to a file and see if trailing spaces.

>Art: I also simulate the trouble using a var with spaces at the end but the result is fine as well:
MODEL=`echo $x | awk -F "[/]" '{print $3}'`

This isn't valid simulation. If you change to the following to quote the variable $x, you will preserve the spaces:
MODEL=$(echo "$x" | awk -F "[/]" '{print $3}'); echo "$MODEL x"

Also the scummy C shell seems to strip the trailing spaces because the result of `` has trailing whitespaces removed. But not a real shell.

[Adam Noble]

yes now you say this I log onto other RP4440 servers and there is not a problem however I'll send you the output below to prove my point. Can't think what it is then:-

/root]MODEL=`model | awk -F "[/]" '{print $3}'`
root:/root]echo $MODEL
rp4440
root@meskpweb:/root]echo "$MODEL adam"
rp4440 adam

[Peter Nikitka]

Hi Adam,

your space is located between the two string in the string presented to the echo command: "$MODEL adam"

root@meskpweb:/root]echo "$MODEL adam"
rp4440 adam

try
echo ":$MODEL:"

mfG Peter

[Adam Noble]

No I've lost the plot I printed the valid system output this is what I should have printed which is from the server I have the issue with:-

root@:/root]MODEL=`model | awk -F "[/]" '{print $3}'`
root@:/root]echo $MODEL
rp4440
root@meskpweb:/root]echo "$MODEL adam"
rp4440 adam
root@:/root]

[Adam Noble]

I'm going crackers here!!!! The space is visible when I copy it into the reply box. However when I submit it the spaces dissapear. It looks like this "rp4440 adam" however maybe this space will dissapear

O well trust me its there on the unix box as when I create my output all servers are fine apart from this one which has two spaces before the next variable. Anyway the problem is fixed and I am going mad.

Thanks

[Hein van den Heuvel]

>> I'm going crackers here!!!! The space is visible when I copy it into the reply box.

The forum webpage/software is nasty that way.

Multiple tabs/spaces are condended to 1 space UNLESS you check the box for:
"Retain format(spacing). URLs will not be clickable"

When discussing a problem where exact input or output format is critical it is best to attach a ".txt" file with clear examples of what is shown and how it should be transformed.

fwiw,
Hein.

[Adam Noble]

thanks for that so I'm not going mad which is good.