picomcs: 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/picomcs - from package: picosat

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

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