Accepting CTRL-C as input
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 Dec 16 at 23:22
Rui F Ribeiro
38.9k1479129
asked Dec 16 at 19:01
Miggu
133
|
show 1 more comment
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 Dec 16 at 23:22
Rui F Ribeiro
38.9k1479129
asked Dec 16 at 19:01
Miggu
133
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
Dec 16 at 19:14
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
Dec 16 at 19:15
@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
Dec 16 at 19:19
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
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
Dec 16 at 19:25
|
show 1 more comment
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 Dec 16 at 23:22
Rui F Ribeiro
38.9k1479129
asked Dec 16 at 19:01
Miggu
133
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 Dec 16 at 23:22
Rui F Ribeiro
38.9k1479129
asked Dec 16 at 19:01
Miggu
133
edited Dec 16 at 23:22
Rui F Ribeiro
38.9k1479129
asked Dec 16 at 19:01
Miggu
133
edited Dec 16 at 23:22
Rui F Ribeiro
38.9k1479129
edited Dec 16 at 23:22
Rui F Ribeiro
38.9k1479129
edited Dec 16 at 23:22
Rui F Ribeiro
38.9k1479129
38.9k1479129
asked Dec 16 at 19:01
Miggu
133
asked Dec 16 at 19:01
Miggu
133
asked Dec 16 at 19:01
Miggu
133
133
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
Dec 16 at 19:14
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
Dec 16 at 19:15
@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
Dec 16 at 19:19
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
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
Dec 16 at 19:25
|
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
Dec 16 at 19:14
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
Dec 16 at 19:15
@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
Dec 16 at 19:19
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
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
Dec 16 at 19:25
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
Dec 16 at 19:14
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
Dec 16 at 19:14
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
Dec 16 at 19:15
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
Dec 16 at 19:15
@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
Dec 16 at 19:19
@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
Dec 16 at 19:19
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
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
Dec 16 at 19:25
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
Dec 16 at 19:25
|
show 1 more comment
1 Answer
1
active
oldest
votes
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 Dec 16 at 19:38
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2,799613
add a comment |
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votes
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 Dec 16 at 19:38
V13
2,799613
add a comment |
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 Dec 16 at 19:38
V13
2,799613
add a comment |
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 Dec 16 at 19:38
V13
2,799613
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 Dec 16 at 19:38
V13
2,799613
answered Dec 16 at 19:38
V13
2,799613
answered Dec 16 at 19:38
V13
2,799613
answered Dec 16 at 19:38
V13
2,799613
2,799613
add a comment |
add a comment |
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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
Dec 16 at 19:14
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
Dec 16 at 19:15
@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
Dec 16 at 19:19
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
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
Dec 16 at 19:25