10
I need to display a message in the Console and ask for a confirmation. For example, ask the user to type SIM to continue, and verify this.
5 answers
9
From what I understood a possible solution is this below :
echo "Tem certeza que blá, blá, blá ? Digite SIM para continuar ou qualquer outra coisa para terminar"
read resp
if [ $resp. != 'SIM.' ]; then
exit 0
fi
8
To request a confirmation you could also use the following:
echo "Confirmacão... (sim/não)"
read CONFIRMA
case $CONFIRMA in
"sim")
# ...
# ...
;;
"não")
# ...
# ...
;;
*)
echo "Opção inválida."
;;
esac
5
The parameter -n 1 causes the command to read wait for the typing of only one character, without the need to press enter.
The command read has a default return variable called $REPLY, by specifying the declaration of a variable.
#!/bin/bash
read -p "Continuar (S/N)? " -n 1 -r
echo
case "$REPLY" in
s|S ) echo "Sim" ;;
n|N ) echo "Nao" ;;
* ) echo "Invalido" ;;
esac
exit 0
I hope I’ve helped!
4
An interesting alternative to such cases is to use the command select
Something like that:
select i in SIM NAO
do
case "$i" in
"SIM")
echo "continuar";
;;
"NAO")
echo "parar"
exit 0
;;
*)
echo "opção inválida"
exit 0
;;
esac
done
See more here: http://rberaldo.com.br/curso-de-shell-script-modulo-1-scripts-shell-estruturas
1
Using read, as function:
#!/usr/bin/bash
true=1
false=0
confok(){
read -p "$1 [S/n]"
[[ ${REPLY^} == "" ]] && return $true
[[ ${REPLY^} == N ]] && return $false || return $true
}
confno(){
read -p "$1 [N/s]"
[[ ${REPLY^} == "" ]] && return $false
[[ ${REPLY^} == N ]] && return $false || return $true
}
confno "Remover?"
LOK=$?
if (( $LOK )); then
echo "Sim"
else
echo "Nao"
fi
confok "Continuar?"
LOK=$?
if (( $LOK )); then
echo "Sim"
else
echo "Nao"
fi
Output:
Remover? [N/s] n
Nao
Continuar? [S/n] s
Sim
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In addition to the answers below... if bash shell, can use the TMOUT variable to set a timeout to the user and to avoid case/minuscule problems :
if echo "$resp" | grep -qi "^sim$" ; then– ceinmart