shell-quote: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/shell-quote - from package: perl-String-ShellQuote

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/shell-quote - from package: libstring-shellquote-perl

You may install the required package with command apt-get install {package}

Error in other languages:
shell-quote: bevel nie gevind nie
shell-quote: comandă negăsită
shell-quote: comando não encontrado
shell-quote: commande introuvable
shell-quote: command not found
shell-quote: käsku ei ole
shell-quote: không tìm thấy lệnh
shell-quote: komanda nerasta
shell-quote: Kommando nicht gefunden.
shell-quote: kommandot finns inte
shell-quote: komut yok
shell-quote: nie znaleziono polecenia
shell-quote: níor aimsíodh an t-ordú
shell-quote: no se encontró la orden
shell-quote: no s'ha trobat l'ordre
shell-quote: opdracht niet gevonden
shell-quote: parancs nem található
shell-quote: perintah tidak ditemukan
shell-quote: príkaz nenájdený
shell-quote: příkaz nenalezen
shell-quote: команда не найдена
shell-quote: командата не е открита
shell-quote: 命令找不到
shell-quote: コマンドが見つかりません