tex-swizzle: 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/lib64/piglit/bin/tex-swizzle - from package: piglit

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

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