[linux] How to remove all white spaces from a given text file

I want to remove all the white spaces from a given text file. Is there any shell command available for this ? Or, how to use sed for this purpose.

I want something like below:

$ cat hello.txt | sed ....

I tried this : cat hello.txt | sed 's/ //g' .But it removes only spaces, not tabs.

Dude, Just python test.py in your terminal.

f = open('/home/hduser/Desktop/data.csv' , 'r')

x = f.read().split()
f.close()

y = ' '.join(x)
f = open('/home/hduser/Desktop/data.csv','w')
f.write(y)
f.close()

This answer is similar to other however as some people have been complaining that the output goes to STDOUT i am just going to suggest redirecting it to the original file and overwriting it. I would never normally suggest this but sometimes quick and dirty works.

cat file.txt | tr -d " \t\n\r" > file.txt

If you want to remove ALL whitespace, even newlines:

perl -pe 's/\s+//g' file

I think you may use sed to wipe out the space while not losing some infomation like changing to another line.

cat hello.txt | sed '/^$/d;s/[[:blank:]]//g'

This is probably the simplest way of doing it:

sed -r 's/\s+//g' filename > output
mv ouput filename

Try this:

tr -d " \t" <filename

See the manpage for tr(1) for more details.

Much simpler to my opinion:

sed -r 's/\s+//g' filename

Easiest way for me ->

        echo "Hello my name is Donald" | sed  s/\ //g

hmm...seems like something on the order of sed -e "s/[ \t\n\r\v]//g" < hello.txt should be in the right ballpark (seems to work under cygwin in any case).

Try this:

sed -e 's/[\t ]//g;/^$/d' 

(found here)

The first part removes all tabs (\t) and spaces, and the second part removes all empty lines