ensembl_gtf_to_gff.pl: 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/ensembl_gtf_to_gff.pl - from package: mmseq

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

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