coqide.opt: 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/coqide.opt - from package: coqide

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

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