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Full Discussion: BASH - read does not wait for user input in some circumstances
Top Forums Shell Programming and Scripting BASH - read does not wait for user input in some circumstances Post 302722723 by jcdole on Sunday 28th of October 2012 12:02:03 PM
Old 10-28-2012
BASH - read does not wait for user input in some circumstances
Hello.

I am running 2 scripts : script_1 and script_2
These scripts are run as root

Script 2 contains :

Code:
#!/bin/bash
#
# ~/bin/script_2
#
E_BAD_PARAM=115
#
date2stamp () {
    date --date "$1" +%Y-%m-%d___%H:%M:%S
}
#
USER_NAME=$1
NB_PARAM=$#
PARAM0=$0
if [ $NB_PARAM -ne 1 ] ; then
    echo "Usage : ~/bin/script_2  user_name"
    exit $E_BAD_PARAM
fi
#
echo "We are in script  2"
#
TIMESTAMP=$(date2stamp  now)
#
if [ -f /home/$USER_NAME/.ssh/id_rsa -a -f /home/$USER_NAME/.ssh/id_rsa.pub  ] ; then
    echo "SSH Keys exists for user : $USER_NAME ."
    echo "Hit CTRL-C to abort"
    echo "Anything else to continue and create a new key for that user"
    read A_LINE
    echo "Creating the key ...."
    mv   /home/$USER_NAME/.ssh/authorized_keys   /home/$USER_NAME/.ssh/authorized_keys.$TIMESTAMP
    mv   /home/$USER_NAME/.ssh/id_rsa   /home/$USER_NAME/.ssh/id_rsa.$TIMESTAMP
    mv   /home/$USER_NAME/.ssh/id_rsa.pub   /home/$USER_NAME/.ssh/id_rsa.pub.$TIMESTAMP
fi
#
echo "Done."

When calling from a console

Code:
linux:~/bin # ~/bin/script_2  user_test

I get :
Code:
linux:~/bin # ~/bin/script_2  user_test
We are in script 2
SSH Keys exists for user : user_test .
Hit CTRL-C to abort
Anything else to continue and create a new key for that user

and the program wait until I hit enter or CTRL-C

Now this script is call from script_1

Code:
#!/bin/bash
#
# ~/bin/script_1
#
############################################
#
~/bin/script_2  user_test

When calling from a console

Code:
linux:~/bin # ~/bin/script_1

I get :

Code:
linux:~/bin # ~/bin/script_1
We are in script 2
SSH Keys exists for user : user_test .
Hit CTRL-C to abort
Anything else to continue and create a new key for that user

and the program wait until I hit enter or CTRL-C
So same behavior.

If script_1 is :

Code:
#!/bin/bash
#
# ~/bin/script_1
#
############################################
#
for USER_NAME in toto tata user_test ; do
    echo "User : $USER_NAME"
    if [[ "$USER_NAME" != "user_test" ]] ; then
        continue
    fi
    ~/bin/script_2  "$USER_NAME"
done

Then calling script_1
Code:
linux:~/bin # ~/bin/script _1

give

Code:
linux:~/bin # ~/bin/script_1
We are in script 2
SSH Keys exists for user : user_test .
Hit CTRL-C to abort
Anything else to continue and create a new key for that user

and the program wait until I hit enter or CTRL-C
So same behavior.

In real life, the list of users come from a file

Now script_1 is :

Code:
#!/bin/bash
#
# ~/bin/script_1
#
############################################
#
while read USER_NAME ; do
    echo "User : $USER_NAME"
    if [[ "$USER_NAME" != "user_test" ]] ; then
        continue
    fi
    ~/bin/script_2   "$USER_NAME"
done   <   "~/list_user"

Then calling script_1
Code:
linux:~/bin # ~/bin/script _1

give


Code:
linux:~/bin # ~/bin/script_1
User : bidon
User : user_test
We are in script 2
SSH Keys exists for user : user_test .
Hit CTRL-C to abort
Anything else to continue and create a new key for that user
Creating the key ....
`/home/user_test/.ssh/authorized_keys' -> `/home/user_test/.ssh/authorized_keys.2012-10-28___15:50:57'
`/home/user_test/.ssh/id_rsa' -> `/home/user_test/.ssh/id_rsa.2012-10-28___15:50:57'
`/home/user_test/.ssh/id_rsa.pub' -> `/home/user_test/.ssh/id_rsa.pub.2012-10-28___15:50:57'
version: 1  subdir: 2012_10_25 DIR: /data_1/002_config_linux/install_2012_09_04/006_backup_current_conf_files
Generating public/private rsa key pair.
........
........
Done

Now script 2 does not wait for "enter" or "CTRL-C"

I think that the problem come from because there is 2 read commands in sequence
One to get user name one by one
And the second which wait for user input.

Any idea to make this working ?

---------- Post updated at 17:02 ---------- Previous update was at 16:24 ----------

Finally found info on
HTML Code:
http://unix.stackexchange.com/questions/26601
Make change in script_1
before :
Code:
#!/bin/bash
#
# ~/bin/script_1
#
############################################
#
while read USER_NAME ; do
    echo "User : $USER_NAME"
    if [[ "$USER_NAME" != "user_test" ]] ; then
        continue
    fi
    ~/bin/script_2   "$USER_NAME"
done   <   "~/list_user"

after correction :
Code:
#!/bin/bash
#
# ~/bin/script_1
#
############################################
#
while read USER_NAME <&5  ; do
    echo "User : $USER_NAME"
    if [[ "$USER_NAME" != "user_test" ]] ; then
        continue
    fi
    ~/bin/script_2   "$USER_NAME"
done   5<   "~/list_user"

Thread is closed.

Thank you for taking time to re'ad this thread
 

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