output redirection using exec command
below is the program i have written to redirect the output to file using my own file descriptor. Iam able to successfully redirect the output to a file .
But the problem iamm facing is that , after closing my file descriptor still my programs writes the output to the file
How to solve this problem , any help is really appreciated
#script5
#!/bin/bash
#script to create our own file descriptor
exec 4>fileout
#redirect standard output to file descriptor 4
exec 1>&4
echo "This is a test program"
exec 4&-
echo " Back to normal"
# i want the output back to normal to be displayed on the screen , but it is getting stored in the file
Any help is really appreciated.
Using exec is far more complex than docs suggest. Try this instead...
echo "This is a test program" >&4
now it is working
script5
#!/bin/bash
#script to create our own file descriptor
exec 4>fileout
exec 5>&1
#redirect standard output to file descriptor 4
exec 1>&4
echo "This is a test program"
exec 4>&-
exec 1>&5
echo " Back to normal"
exec 5>&-
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