lspst: 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/lspst - from package: libpst

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

On Debian possible default full paths are:

/usr/bin/lspst - from package: pst-utils

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

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