sqitch: 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 Debian possible default full paths are:

/usr/bin/sqitch - from package: sqitch

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

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