Adicionar ao arquivo ~/.bashrc:

export HISTCONTROL=ignorespace

Quando for executar um comando no shell, colocar um espaço em branco

while read i; do
  echo $i
done < file.txt

# .bashrc
 
# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi
 
# Uncomment the following line if you don't like systemctl's auto-paging feature:
# export SYSTEMD_PAGER=
 
# # ex - archive extractor
# # usage: ex <file>
ex ()
{
  if [ -f $1 ] ; then
    case $1 in
      *.tar.bz2)   tar xjf $1   ;;
      *.tar.gz)    tar xzf $1   ;;
      *.bz2)       bunzip2 $1   ;;
      *.rar)       urar $1      ;;
      *.gz)        gunzip $1    ;;
      *.tar)       tar xf $1    ;;
      *.tbz2)      tar xjf $1   ;;
      *.tgz)       tar xzf $1   ;;
      *.zip)       unzip $1     ;;
      *.Z)         uncompress $1;;
      *.7z)        7z x $1      ;;
      *)           echo "'$1' cannot be extracted via ex()" ;;
    esac
  else
    echo "'$1' is not a valid file"
  fi
}
 
export HISTCONTROL=ignorespace
export LANG="en_US"
export PS1='\[\e[0;33m\]\u@\h\[\e[m\] \[\e[1;34m\]\w\[\e[m\] \[\e[0;33m\]\$\[\e[m\] \[\e[1;37m\]'
export VISUAL="vim"
 
alias ll="ls -l"
alias sudo="PS1='\[\e[0;31m\]\u@\h\[\e[m\] \[\e[1;34m\]\w\[\e[m\] \[\e[0;31m\]\\$\[\e[m\] \[\e[1;37m\]' sudo"