Discussion on: My Shell Aliases

backup() { cp "$1"{,.bak};} 
mcd() {   [ -n "$1" ] && mkdir -p "$@" && cd "$1";   }
psx() { ps -ax | grep -v grep | grep "$@"; }function psx() { ps -ax | grep -v grep | grep "$@"; }

pskill(){
    ps aux | grep "$1" | grep -v grep | awk '{print $2;}' | while read p; do kill -9 $p; done
}


extract() { 
    if [ -f $1 ] ; then 
      case $1 in 
        *.tar.bz2)   tar xjf $1     ;; 
        *.tar.gz)    tar xzf $1     ;; 
        *.bz2)       bunzip2 $1     ;; 
        *.rar)       unrar e $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 extract()" ;; 
         esac 
     else 
         echo "'$1' is not a valid file" 
     fi 
}

#-------------------------------------------------------------
# Mimic the behavior of Mac Open Command while preserving the 
# errors generated
#-------------------------------------------------------------

open() {
    if [ $# -eq 0 ]
    then    
        xdg-open .;
    else
        xdg-open "$@" &>/home/Abhinav/.xsession-errors;
    fi
}