pic: 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/pic - from package: groff

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

On Debian possible default full paths are:

/usr/bin/pic - from package: groff-base

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

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