recoll: 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/recoll - from package: recoll

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

On Debian possible default full paths are:

/usr/bin/recoll - from package: recoll

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

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