Accepting CTRL-C as input
up vote
2
down vote
favorite
I have one problem in a Linux script.
#!/bin/bash
x=1;
while [ $x != 0 ]
do
echo "Type a command:"
read -r command
eval "$command"
if [ "$command" = end ]
then x=0;
fi
if [ "$command" = kill ]
then echo "To end the program, type the end"
fi
done
And I want to make the same thing with CTRL_C like for kill. When a user types CTRL_C, script will display: To end the program, type the end. But I don't know how to do that.
An assignment is :
Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
shell-script scripting
edited 22 mins ago
Rui F Ribeiro
38.6k1479128
asked 4 hours ago
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
|
show 1 more comment
up vote
2
down vote
favorite
I have one problem in a Linux script.
#!/bin/bash
x=1;
while [ $x != 0 ]
do
echo "Type a command:"
read -r command
eval "$command"
if [ "$command" = end ]
then x=0;
fi
if [ "$command" = kill ]
then echo "To end the program, type the end"
fi
done
And I want to make the same thing with CTRL_C like for kill. When a user types CTRL_C, script will display: To end the program, type the end. But I don't know how to do that.
An assignment is :
Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
shell-script scripting
edited 22 mins ago
Rui F Ribeiro
38.6k1479128
asked 4 hours ago
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ctrl+C can be handled in atrapstatement, or you can arrange things so that the Ctrl-C is read as a character by theread. Which would you prefer? If this is an assignment , please give us all the details.
– Mark Plotnick
4 hours ago
Ignoring your question for the moment, should't theeval $commandpart be after the twoifs? You may also want to take a look atcasein the Compound Commands section of the man page forbash.
– nohillside
4 hours ago
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
4 hours ago
@nohillside Sure, I will consider that.
– Miggu
4 hours ago
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
4 hours ago
|
show 1 more comment
up vote
2
down vote
favorite
up vote
2
down vote
favorite
I have one problem in a Linux script.
#!/bin/bash
x=1;
while [ $x != 0 ]
do
echo "Type a command:"
read -r command
eval "$command"
if [ "$command" = end ]
then x=0;
fi
if [ "$command" = kill ]
then echo "To end the program, type the end"
fi
done
And I want to make the same thing with CTRL_C like for kill. When a user types CTRL_C, script will display: To end the program, type the end. But I don't know how to do that.
An assignment is :
Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
shell-script scripting
edited 22 mins ago
Rui F Ribeiro
38.6k1479128
asked 4 hours ago
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have one problem in a Linux script.
#!/bin/bash
x=1;
while [ $x != 0 ]
do
echo "Type a command:"
read -r command
eval "$command"
if [ "$command" = end ]
then x=0;
fi
if [ "$command" = kill ]
then echo "To end the program, type the end"
fi
done
And I want to make the same thing with CTRL_C like for kill. When a user types CTRL_C, script will display: To end the program, type the end. But I don't know how to do that.
An assignment is :
Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
shell-script scripting
shell-script scripting
edited 22 mins ago
Rui F Ribeiro
38.6k1479128
asked 4 hours ago
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 22 mins ago
Rui F Ribeiro
38.6k1479128
asked 4 hours ago
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 22 mins ago
Rui F Ribeiro
38.6k1479128
edited 22 mins ago
Rui F Ribeiro
38.6k1479128
edited 22 mins ago
Rui F Ribeiro
38.6k1479128
38.6k1479128
asked 4 hours ago
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Miggu
133
asked 4 hours ago
Miggu
133
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ctrl+C can be handled in atrapstatement, or you can arrange things so that the Ctrl-C is read as a character by theread. Which would you prefer? If this is an assignment , please give us all the details.
– Mark Plotnick
4 hours ago
Ignoring your question for the moment, should't theeval $commandpart be after the twoifs? You may also want to take a look atcasein the Compound Commands section of the man page forbash.
– nohillside
4 hours ago
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
4 hours ago
@nohillside Sure, I will consider that.
– Miggu
4 hours ago
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
4 hours ago
|
show 1 more comment
Ctrl+C can be handled in atrapstatement, or you can arrange things so that the Ctrl-C is read as a character by theread. Which would you prefer? If this is an assignment , please give us all the details.
– Mark Plotnick
4 hours ago
Ignoring your question for the moment, should't theeval $commandpart be after the twoifs? You may also want to take a look atcasein the Compound Commands section of the man page forbash.
– nohillside
4 hours ago
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
4 hours ago
@nohillside Sure, I will consider that.
– Miggu
4 hours ago
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
4 hours ago
Ctrl+C can be handled in a
trap statement, or you can arrange things so that the Ctrl-C is read as a character by the read. Which would you prefer? If this is an assignment , please give us all the details.– Mark Plotnick
4 hours ago
Ctrl+C can be handled in a
trap statement, or you can arrange things so that the Ctrl-C is read as a character by the read. Which would you prefer? If this is an assignment , please give us all the details.– Mark Plotnick
4 hours ago
Ignoring your question for the moment, should't the
eval $command part be after the two ifs? You may also want to take a look at case in the Compound Commands section of the man page for bash.– nohillside
4 hours ago
Ignoring your question for the moment, should't the
eval $command part be after the two ifs? You may also want to take a look at case in the Compound Commands section of the man page for bash.– nohillside
4 hours ago
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
4 hours ago
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
4 hours ago
@nohillside Sure, I will consider that.
– Miggu
4 hours ago
@nohillside Sure, I will consider that.
– Miggu
4 hours ago
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
4 hours ago
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
4 hours ago
|
show 1 more comment
1 Answer
1
active
oldest
votes
up vote
2
down vote
accepted
Ctrl-C is "special" when you have terminal emulation because it is caught and results in a signal (SIGINT) to be sent to your script. You have two options:
- You can make your script catch SIGINT and handle it as you wish. This is done with
trap xxx SIGINTwhere xxx is a bash function to execute - You can make the terminal ignore ctrl-c by running
stty intr undef. You'll most probably have some issues catching ctrl-c though.
answered 4 hours ago
V13
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
accepted
Ctrl-C is "special" when you have terminal emulation because it is caught and results in a signal (SIGINT) to be sent to your script. You have two options:
- You can make your script catch SIGINT and handle it as you wish. This is done with
trap xxx SIGINTwhere xxx is a bash function to execute - You can make the terminal ignore ctrl-c by running
stty intr undef. You'll most probably have some issues catching ctrl-c though.
answered 4 hours ago
V13
2,724613
add a comment |
up vote
2
down vote
accepted
Ctrl-C is "special" when you have terminal emulation because it is caught and results in a signal (SIGINT) to be sent to your script. You have two options:
- You can make your script catch SIGINT and handle it as you wish. This is done with
trap xxx SIGINTwhere xxx is a bash function to execute - You can make the terminal ignore ctrl-c by running
stty intr undef. You'll most probably have some issues catching ctrl-c though.
answered 4 hours ago
V13
2,724613
add a comment |
up vote
2
down vote
accepted
up vote
2
down vote
accepted
Ctrl-C is "special" when you have terminal emulation because it is caught and results in a signal (SIGINT) to be sent to your script. You have two options:
- You can make your script catch SIGINT and handle it as you wish. This is done with
trap xxx SIGINTwhere xxx is a bash function to execute - You can make the terminal ignore ctrl-c by running
stty intr undef. You'll most probably have some issues catching ctrl-c though.
answered 4 hours ago
V13
2,724613
Ctrl-C is "special" when you have terminal emulation because it is caught and results in a signal (SIGINT) to be sent to your script. You have two options:
- You can make your script catch SIGINT and handle it as you wish. This is done with
trap xxx SIGINTwhere xxx is a bash function to execute - You can make the terminal ignore ctrl-c by running
stty intr undef. You'll most probably have some issues catching ctrl-c though.
answered 4 hours ago
V13
2,724613
answered 4 hours ago
V13
2,724613
answered 4 hours ago
V13
2,724613
answered 4 hours ago
V13
2,724613
2,724613
add a comment |
add a comment |
Miggu is a new contributor. Be nice, and check out our Code of Conduct.
Miggu is a new contributor. Be nice, and check out our Code of Conduct.
Miggu is a new contributor. Be nice, and check out our Code of Conduct.
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Ctrl+C can be handled in a
trapstatement, or you can arrange things so that the Ctrl-C is read as a character by theread. Which would you prefer? If this is an assignment , please give us all the details.– Mark Plotnick
4 hours ago
Ignoring your question for the moment, should't the
eval $commandpart be after the twoifs? You may also want to take a look atcasein the Compound Commands section of the man page forbash.– nohillside
4 hours ago
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
4 hours ago
@nohillside Sure, I will consider that.
– Miggu
4 hours ago
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
4 hours ago