A code as
#!/bin/bash
exec 3>&1 4>&2
exec 1>/tmp/stdout.log
exec 2>/tmp/stderr.log
PS4='+ (Line $LINENO) '
set -x
echo "This goes to /tmp/stdout.log"
echo "This goes to /tmp/stderr.log" 1>&2
cmd1="$(uname -a)"
cmd2="$(uname +-a)"
exec 1>&3
read -n 1 -s -r -p "Please do manually Installation of package ,Press any key to continue"
exec 1>&3 2>&4
exec 3>&- 4>&-
I tried to restore exec 1>&3 so read is echo but its not showing when i do normal echo "hello" it shows but not with read.
For selective places in code where I want to user intervention I restore output handling but instead the script waits for command to enter and then execute.
You are expecting read to print to stdout, but it prints to stderr as demonstrated by this command:
> read -p "prompt" 2>/dev/null # this command will print nothing
Look in your /tmp/stderr.log. The missing prompt will be in there.
To restore the ability of read to print to your screen, instead of restoring stdout, you need to restore stderr:
exec 2>&4
read -n 1 -s -r -p "Please do manually Installation of package ,Press any key to continue"
Alternatively, as noted in the comments, instead of restoring stderr with a separate command, you can restore it just for the read command:
read -n 1 -s -r -p "<shortened for clarity>" 2>&4