Scripting util curl awk bash y parseos

Scripting util curl awk bash y parseos

Este post reune patrones utiles para automatizar tareas, probar endpoints HTTP, parsear logs y construir pequenos scripts shell.

curl

curl -Ik https://app.example.local/
curl -sS https://app.example.local/api/health
curl -X POST https://app.example.local/api \
  -H 'Content-Type: application/json' \
  -d '{"clave":"valor"}'

awk

awk '{print $1}' fichero.log
awk -F';' '{print $1,$3}' fichero.csv
awk '$9 ~ /^5/ {print $0}' access.log

regex utiles

grep -E 'ERROR|WARN|FATAL' app.log
grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}' app.log | sort -u

parsear logs HTTP

awk '{print $1}' access.log | sort | uniq -c | sort -nr | head
awk '{print $9}' access.log | sort | uniq -c | sort -nr

plantilla bash

#!/usr/bin/env bash
set -euo pipefail

main() {
  local fichero="${1:-}"
  if [[ -z "$fichero" ]]; then
    printf 'Uso: %s <fichero>\n' "$0" >&2
    exit 1
  fi

  grep -E 'ERROR|WARN' "$fichero"
}

main "$@"