picosat: 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/picosat - from package: picosat

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

On Debian possible default full paths are:

/usr/bin/picosat - from package: picosat

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

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