semver: 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/semver - from package: nodejs-semver
/usr/lib/node_modules/semver/bin/semver - from package: nodejs-semver

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

On Debian possible default full paths are:

/usr/bin/semver - from package: node-semver
/usr/lib/nodejs/semver/bin/semver - from package: node-semver

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

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