texmacs.bin: command not found

Have You tried accessing the binary with the full path?

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/libexec/TeXmacs/bin/texmacs.bin - from package: TeXmacs

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