strace-log-merge: 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/strace-log-merge - from package: strace

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

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