bcftools: 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/bcftools - from package: samtools

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

On Debian possible default full paths are:

/usr/bin/bcftools - from package: samtools

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

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