124 lines
1.7 KiB
Markdown
124 lines
1.7 KiB
Markdown
#Temario-BSA - Bash Scripting Avanzado
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Proveniente de [[Mecánica Unix - Manejo de la shell]]
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---
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## Control de flujo
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---
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### Condicionales `if`, `elif`, `else` y `fi`
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```Shell
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if [[ "$num" -gt 10 ]]; then
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echo "Mayor que 10"
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elif [[ "$num" -eq 10 ]]; then
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echo "Es 10"
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else
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echo "Es menor que 10"
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fi
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```
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---
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### `[[ . . . ]]`
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```Shell
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if [[ "$x" == "hola" && -n "$x" ]]; then
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echo "coincide"
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fi
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```
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---
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### `!` (negación)
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``` Shell
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if ! grep -q "hola" archivos.txt; then
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echo "no existe hola"
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fi
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```
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---
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## `case...in...esac`
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```Shell
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case $option in
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start) echo "iniciando";;
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stop) echo "Finalizando";;
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*) echo "Opción no válida";;
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esac
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```
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---
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## `for, in, do, done` (Bucles)
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```Shell
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for i in 1 2 3; do
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echo "numero $i"
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done
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```
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---
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## `while, until` (Bucles condicionales)
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```Shell
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while [[ "$x" -lt 5 ]]; do
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echo $x
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((x++))
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done
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```
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```Shell
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until [[ "$x" -eq 5 ]]; do
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echo $x
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((x++))
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done
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```
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---
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## `select` (Menú interactivo)
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```Shell
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select opcion in Start Stop Exit; do
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echo "Elegiste la opcion $opcion"
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done
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```
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---
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## Contador de longitud
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```Shell
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validador() {
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local passwd=$1
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local long=${#passwd} # Para leer longitud de un dato, se usa ${#variable}
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if [[ "$long" -gt 8 ]]; then
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echo "PWD_GT_8"
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else
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echo "PWD_LT_8"
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fi
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}
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```
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---
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### Verificación de mayúsculas, minúsculas, números y caracteres especiales
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Se utiliza el comparador de valores regex (`=~`) en conjunto con los valores regex:
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#### ¿Minúscula?
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```Shell
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[[ "Hola123" =~ [a-z] ]] # true
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```
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##### ¿Mayúscula?
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```Shell
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[[ "Hola123" =~ [A-Z] ]] # true
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```
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##### ¿Números?
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```Shell
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[[ "abc123def" =~ [0-9] ]] # true
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```
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###### ¿Caracteres especiales?
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```Shell
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[[ "asd1!213das" =~ [^a-zA-Z0-9] ]] # true
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```
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