fastqc: 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/fastqc - from package: fastqc

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

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