{"id":353801,"date":"2024-10-02T11:48:24","date_gmt":"2024-10-02T11:48:24","guid":{"rendered":"https:\/\/www.ninjaone.com\/script-hub\/monitorizar-los-archivos-de-registro-linux\/"},"modified":"2024-10-13T19:04:40","modified_gmt":"2024-10-13T19:04:40","slug":"monitorizar-los-archivos-de-registro-linux","status":"publish","type":"script_hub","link":"https:\/\/www.ninjaone.com\/es\/script-hub\/monitorizar-los-archivos-de-registro-linux\/","title":{"rendered":"C\u00f3mo monitorizar los archivos de registro y detectar patrones de texto espec\u00edficos en Linux usando un script bash"},"content":{"rendered":"

Monitorizar los archivos de registro y detectar patrones de texto espec\u00edficos es una tarea crucial para los profesionales de TI, especialmente en el contexto de la administraci\u00f3n de sistemas y la ciberseguridad<\/a>. Los scripts automatizados que pueden alertar sobre cadenas de texto espec\u00edficas dentro de los archivos son herramientas muy valiosas en la caja de herramientas de cualquier profesional de TI.<\/p>\n

El script proporcionado cumple esta tarea eficazmente, ofreciendo una soluci\u00f3n robusta para\u00a0monitorizar los archivos de registro y alertar de la aparici\u00f3n de cadenas de texto espec\u00edficas<\/strong>. Este post profundizar\u00e1 en la funcionalidad del script, explorar\u00e1 sus aplicaciones en el mundo real y discutir\u00e1 las mejores pr\u00e1cticas para su uso.<\/p>\n

Comprender el script y su significado<\/h2>\n

En los entornos de TI, diversos sistemas, aplicaciones y procesos generan continuamente archivos de registro. Estos registros contienen informaci\u00f3n vital sobre las operaciones del sistema, errores, eventos de seguridad y actividades de los usuarios. Sin embargo, supervisar manualmente estos archivos en busca de eventos cr\u00edticos o cadenas de texto es poco pr\u00e1ctico y propenso a errores<\/a>. Aqu\u00ed es donde la automatizaci\u00f3n mediante scripts resulta esencial.<\/p>\n

El script proporcionado est\u00e1 dise\u00f1ado para buscar un texto espec\u00edfico dentro de un archivo de registro y generar una alerta cuando se encuentra ese texto. Este script es especialmente \u00fatil para proveedores de servicios gestionados (MSP)<\/a> y administradores de TI que necesitan monitorizar los archivos de registro para detectar incidentes de seguridad, errores de aplicaciones o cualquier otro evento significativo que pueda requerir atenci\u00f3n inmediata.<\/p>\n

El script para monitorizar los archivos de registro<\/h2>\n
#!\/usr\/bin\/env bash\r\n\r\n# Description: Alert when the specified Text is found in a text file.\r\n#\r\n# Release Notes: Initial Release\r\n#   By using this script, you indicate your acceptance of the following legal terms as well as our Terms of Use at https:\/\/www.ninjaone.com\/terms-of-use.\r\n#   Ownership Rights: NinjaOne owns and will continue to own all right, title, and interest in and to the script (including the copyright). NinjaOne is giving you a limited license to use the script in accordance with these legal terms. \r\n#   Use Limitation: You may only use the script for your legitimate personal or internal business purposes, and you may not share the script with another party. \r\n#   Republication Prohibition: Under no circumstances are you permitted to re-publish the script in any script library or website belonging to or under the control of any other software provider. \r\n#   Warranty Disclaimer: The script is provided \u201cas is\u201d and \u201cas available\u201d, without warranty of any kind. NinjaOne makes no promise or guarantee that the script will be free from defects or that it will meet your specific needs or expectations. \r\n#   Assumption of Risk: Your use of the script is at your own risk. You acknowledge that there are certain inherent risks in using the script, and you understand and assume each of those risks. \r\n#   Waiver and Release: You will not hold NinjaOne responsible for any adverse or unintended consequences resulting from your use of the script, and you waive any legal or equitable rights or remedies you may have against NinjaOne relating to your use of the script. \r\n#   EULA: If you are a NinjaOne customer, your use of the script is subject to the End User License Agreement applicable to you (EULA).\r\n#\r\n# Text to trigger on: [Alert]\r\n#\r\n# Below are all the valid parameters for this script.\r\n# Preset Parameter: --file \"\/opt\/MyLogFile.log\" --text batman\r\n#   Alerts when the text \"batman\" is found in the file \/opt\/MyLogFile.log\r\n#    This is Case Sensitive\r\n#     Example where it will alert: \"I am batman!\"\r\n#     Example where it will alert: \"Iambatman!\"\r\n#     Example where it will not alert: \"IamBatman!\"\r\n#     Example where it will not alert: \"I am Batman!\"\r\n#\r\n# Preset Parameter: --file \"\/opt\/MyLogFile.log\" --text Batman --caseInsensitive true\r\n#   Alerts when the text \"Batman\" is found in the file \/opt\/MyLogFile.log, but is case insensitive\r\n#    This is Case Insensitive\r\n#     Example where it will alert: \"I am batman!\"\r\n#     Example where it will alert: \"Iambatman!\"\r\n#\r\n# Preset Parameter: --file \"\/opt\/MyLogFile.log\" --text Batman --wholeWord true\r\n#   Alerts when the text \"Batman\" is found in the file \/opt\/MyLogFile.log, but only if it is a word in a sentence.\r\n#    This is Case Sensitive\r\n#     Example where it will alert: \"I am Batman!\"\r\n#     Example where it will not alert: \"IamBatman!\"\r\n#\r\n\r\n# Determines whether or not help text is necessary and routes the output to stderr\r\ndie() {\r\n    local _ret=\"${2:-1}\"\r\n    test \"${_PRINT_HELP:-no}\" = yes && print_help >&2\r\n    echo \"$1\" >&2\r\n    exit \"${_ret}\"\r\n}\r\n\r\n# Function that evaluates whether a value passed to it begins by a character\r\n# that is a short option of an argument the script knows about.\r\n# This is required in order to support getopts-like short options grouping.\r\nbegins_with_short_option() {\r\n    local first_option all_short_options='ftiwh'\r\n    first_option=\"${1:0:1}\"\r\n    test \"$all_short_options\" = \"${all_short_options\/$first_option\/}\" && return 1 || return 0\r\n}\r\n\r\n# THE DEFAULTS INITIALIZATION - OPTIONALS\r\n_arg_file=\r\n_arg_text=\r\n_arg_caseInsensitive=\"false\"\r\n_arg_wholeWord=\"false\"\r\n\r\n# Help text function for when invalid input is encountered\r\nprint_help() {\r\n    printf '%s\\n' \"Alert when the specified Text is found in a text file.\"\r\n    printf 'Usage: %s [-f|--file [path to file]] [-t|--text [text to search]] [-i|--caseInsensitive <true|false>] [-w|--wholeWord <true|false>] [-h|--help]\\n' \"$0\"\r\n    printf '\\t%s\\n' \"-f, --file: path to a log file\"\r\n    printf '\\t%s\\n' \"-t, --text: text to alert when found\"\r\n    printf '\\t%s\\n' \"-i, --caseInsensitive: search text with case insensitivity (default: false)\"\r\n    printf '\\t%s\\n' \"-w, --wholeWord: search for text as a whole word (default: false)\"\r\n    printf '\\t%s\\n' \"-h, --help: Prints help\"\r\n}\r\n\r\n# Grabbing the parameters and parsing through them.\r\nparse_commandLine() {\r\n    while test $# -gt 0; do\r\n        _key=\"$1\"\r\n        case \"$_key\" in\r\n        -f | --file)\r\n            test $# -lt 2 && die \"Missing value for the optional argument '$_key'.\" 1\r\n            _arg_file=\"$2\"\r\n            shift\r\n            ;;\r\n        --file=*)\r\n            _arg_file=\"${_key##--file=}\"\r\n            ;;\r\n        -f*)\r\n            _arg_file=\"${_key##-f}\"\r\n            ;;\r\n        -t | --text)\r\n            test $# -lt 2 && die \"Missing value for the optional argument '$_key'.\" 1\r\n            _arg_text=\"$2\"\r\n            shift\r\n            ;;\r\n        --text=*)\r\n            _arg_text=\"${_key##--text=}\"\r\n            ;;\r\n        -t*)\r\n            _arg_text=\"${_key##-t}\"\r\n            ;;\r\n        -i | --caseInsensitive)\r\n            test $# -lt 2 && die \"Missing value for the optional argument '$_key'.\" 1\r\n            _arg_caseInsensitive=\"$2\"\r\n            shift\r\n            ;;\r\n        --caseInsensitive=*)\r\n            _arg_caseInsensitive=\"${_key##--caseInsensitive=}\"\r\n            ;;\r\n        -i*)\r\n            _arg_caseInsensitive=\"${_key##-i}\"\r\n            ;;\r\n        -w | --wholeWord)\r\n            test $# -lt 2 && die \"Missing value for the optional argument '$_key'.\" 1\r\n            _arg_wholeWord=\"$2\"\r\n            shift\r\n            ;;\r\n        --wholeWord=*)\r\n            _arg_wholeWord=\"${_key##--wholeWord=}\"\r\n            ;;\r\n        -w*)\r\n            _arg_wholeWord=\"${_key##-w}\"\r\n            ;;\r\n        -h | --help)\r\n            print_help\r\n            exit 0\r\n            ;;\r\n        -h*)\r\n            print_help\r\n            exit 0\r\n            ;;\r\n        *)\r\n            _PRINT_HELP=yes die \"FATAL ERROR: Got an unexpected argument '$1'\" 1\r\n            ;;\r\n        esac\r\n        shift\r\n    done\r\n}\r\n\r\nparse_commandLine \"$@\"\r\n\r\ntext=$_arg_text\r\nfile=$_arg_file\r\ncaseInsensitive=$_arg_caseInsensitive\r\nwholeWord=$_arg_wholeWord\r\n\r\n# Check if Script Variables where used and overwrite command line parameters\r\nif [[ -n \"${textToMatch}\" ]]; then\r\n    text=$textToMatch\r\nfi\r\nif [[ -n \"${textFile}\" ]]; then\r\n    file=$textFile\r\nfi\r\nif [[ -n \"${matchWholeWord}\" ]]; then\r\n    wholeWord=$matchWholeWord\r\nfi\r\nif [[ -n \"${insensitiveToCase}\" ]]; then\r\n    caseInsensitive=$insensitiveToCase\r\nfi\r\n\r\n# Check if text is not an empty string\r\nif [[ -z \"${text}\" ]]; then\r\n    echo \"[Error] Text not specified\"\r\n    exit 2\r\nfi\r\n\r\n# Check if text is not an empty string\r\nif [[ -z \"${file}\" ]]; then\r\n    echo \"[Error] File not specified\"\r\n    exit 2\r\nfi\r\n\r\n# Does file exit and is readable\r\nif [ -f \"${file}\" ]; then\r\n    echo \"[Info] File \\\"${file}\\\" exists\"\r\n    if [ -r \"${file}\" ]; then\r\n        echo \"[Info] File \\\"${file}\\\" is readable\"\r\n    else\r\n        echo \"[Error] File \\\"${file}\\\" is not readable\"\r\n        exit 2\r\n    fi\r\nelse\r\n    echo \"[Error] File \\\"${file}\\\" does not exists\"\r\n    exit 2\r\nfi\r\n\r\n# Detect\r\ncount=0\r\nif [[ \"${wholeWord}\" == \"true\" ]]; then\r\n    if [[ \"${caseInsensitive}\" == \"true\" ]]; then\r\n        count=$(grep -c -i -n -w \"$text\" \"$file\")\r\n    else\r\n        count=$(grep -c -n -w \"$text\" \"$file\")\r\n    fi\r\nelse\r\n    if [[ \"${caseInsensitive}\" == \"true\" ]]; then\r\n        count=$(grep -c -i -n -e \"$text\" \"$file\")\r\n    else\r\n        count=$(grep -c -n -e \"$text\" \"$file\")\r\n    fi\r\nfi\r\n\r\n# Alert\r\nif ((count > 0)); then\r\n    echo \"[Alert] Found text in file\"\r\n    exit 1\r\nelse\r\n    echo \"[Info] Not found text in file\"\r\n    exit 0\r\nfi<\/pre>\n
 <\/p>\n\n
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Desglose detallado del script<\/h2>\n
Veamos con m\u00e1s detalle c\u00f3mo funciona este script:<\/p>\n
1. Parsing de los\u00a0par\u00e1metros<\/strong>:\u00a0<\/strong><\/p>\n