How to remove space from string

Question

In ubuntu bash script how to remove space from one variable  string will be      3918912k    Want to remove all blank space

User · Answer

The tools sed or tr will do this for you by swapping the whitespace for nothing  sed  s    g   tr -d      Example     echo     3918912k     sed  s    g  3918912k

User · Answer

Since you re using bash  the fastest way would be   shopt -s extglob   Allow extended globbing var   lakdjsf   lkadsjf   echo    var       space          It s fastest because it uses built-in functions instead of firing up extra processes   However  if you want to do it in a POSIX-compliant way  use sed   var   lakdjsf   lkadsjf   echo   var    sed  s    space     g

User · Answer

A funny way to remove all spaces from a variable is to use printf     myvar  a cool variable    with   lots of   spaces in it    printf -v myvar   s   myvar   echo   myvar  acoolvariablewithlotsofspacesinit   It turns out it s slightly more efficient than myvar    myvar        but not safe regarding globs     that can appear in the string  So don t use it in production code   If you really really want to use this method and are really worried about the globbing thing  and you really should   you can use set -f  which disables globbing altogether      ls file1  file2   myvar    a cool variable with spaces  and  oh  no  there is  a  glob     in it    echo   myvar    a cool variable with spaces  and  oh  no  there is  a  glob     in it   printf   s   myvar   echo acoolvariablewithspacesandoh no thereisaglobfile1file2init     See the trouble  Let s fix it with set -f    set -f   printf   s   myvar   echo acoolvariablewithspacesandoh no thereisaglob init     Since we like globbing  we unset the f option    set  f   I posted this answer just because it s funny  not to use it in practice

User · Answer

Try doing this in a shell  var  quot   3918912k quot  echo   var     blank       That uses parameter expansion  it s a non posix feature     blank    is a POSIX regex class  remove spaces  tabs      see http   www regular-expressions info posixbrackets html

User · Answer

You can also use echo to remove blank spaces  either at the beginning or at the end of the string  but also repeating spaces inside the string     myVar      kokor    iiij     ook          echo   myVar      kokor    iiij     ook         myVar  echo  myVar        myVar is not set to  kokor iiij ook    echo   myVar  kokor iiij ook

[bash] How to remove space from string?

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