sqlite3: 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/sqlite3 - from package: sqlite

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

On Debian possible default full paths are:

/usr/bin/sqlite3 - from package: sqlite3

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

Error in other languages:
sqlite3: bevel nie gevind nie
sqlite3: comandă negăsită
sqlite3: comando não encontrado
sqlite3: commande introuvable
sqlite3: command not found
sqlite3: käsku ei ole
sqlite3: không tìm thấy lệnh
sqlite3: komanda nerasta
sqlite3: Kommando nicht gefunden.
sqlite3: kommandot finns inte
sqlite3: komut yok
sqlite3: nie znaleziono polecenia
sqlite3: níor aimsíodh an t-ordú
sqlite3: no se encontró la orden
sqlite3: no s'ha trobat l'ordre
sqlite3: opdracht niet gevonden
sqlite3: parancs nem található
sqlite3: perintah tidak ditemukan
sqlite3: príkaz nenájdený
sqlite3: příkaz nenalezen
sqlite3: команда не найдена
sqlite3: командата не е открита
sqlite3: 命令找不到
sqlite3: コマンドが見つかりません