idngram_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 Debian possible default full paths are:

/usr/bin/idngram_merge - from package: sunpinyin-utils

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

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