120 lines
1.9 KiB
Markdown
120 lines
1.9 KiB
Markdown
# Bash
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## arrays
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``` bash
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# creates an array variable
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ORPHANS=()
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# checks length
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if [[ ${#ORPHANS[@]} -eq 0 ]]; then
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echo "No orphans found."
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else
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echo "orphans:"
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printf "%s\n" "${ORPHANS[@]}"
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fi
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```
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## associative array
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an data structure that lets you store key → value pairs
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``` bash
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# clean if already been used
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unset PV_PATHS
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# declare an associative array, an data structure that lets you store key → value pairs
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declare -A PV_PATHS
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for name in $(kubectl get pv -o jsonpath='{.items[*].metadata.name}'); do
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path=$(kubectl get pv ${name} -o jsonpath='{.spec.local.path}' 2>/dev/null)
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# check if path is no empty
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[[ -n "${path}" ]] && PV_PATHS["${name}"]="${path}"
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done
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# print only keys
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echo
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echo "All Keys:"
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printf "%s\n" "${!PV_PATHS[@]}"
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echo
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echo "All Values:"
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# print only values
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printf "%s\n" "${PV_PATHS[@]}"
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echo
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echo "Keys|Values:"
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# print all
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for key in "${!PV_PATHS[@]}"; do
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printf "%s|%s\n" "$key" "${PV_PATHS[$key]}"
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done
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```
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## misc
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```bash
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#!/bin/bash
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script_directory="$(dirname "$(readlink -f "$0")")"
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#simbolo para comentário
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if <condition>; then
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<commands>
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fi
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if test $variavel -eq 3; then
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echo
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fi
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if [ $variavel -eq 3 ]; then
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echo
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fi
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if [ ! $variavel -eq 3 ]; then
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echo
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fi
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if [ $variavel -eq 3 -a $variavel -eq 2 -o $variavel -eq 1]; then
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echo
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fi
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``
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#!/bin/bash
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function echoArguments(){
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echo "printing ($#) arguments"
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for ARGUMENT in "$@"
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do
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echo $ARGUMENT
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done
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}
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echoArguments $@
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Também é possível aceder por índice
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#!/bin/bash
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function echoArguments(){
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echo "$0"
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echo "$1"
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}
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echoArguments $@
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Testar se um programa está a correr
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if pgrep jivelite>/dev/null
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then echo "a correr"
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else echo "nao esta correr"
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fi
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verifica o numero de parametros
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cuidado tem que ter mesmo os espaços nos parenteses rectos
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if [ "$#" -ne 2 ]
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then
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echo "wrong number of parameters($#)"
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echo "0 - name of processo to search"
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echo "1 - commando to start"
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exit 1
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fi
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``
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