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#1
June 8th, 2004, 02:30 AM
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BASH Scripting:using file descriptors :(
hi!
how are file descriptors used in BASH? the format for assigning a file descriptor to a particular file is [n]<>file, right? now, suppose i do this: $ : [4]<>temp how do i use it subsequently? i mean, suppose i want to redirect the o/p of a particular command to temp, how do i do it using its file descriptor? this doesnt work either: echo "hello" >&4 where am i going wrong?? kindly help thanx in advance 
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#2
June 21st, 2004, 12:58 AM
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The following script reads the first line from the file dins.c and echoes the first line read from that file.
Code:
#!/bin/sh exec 5<> dins.c # Open "dins.c" and assign fd 5 to it read <&5 # Read the first line exec 5>&- # Close fd 5 echo $REPLY HTH
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#3
June 21st, 2004, 02:02 AM
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thanx for your reply...
now , suppose i want to copy the std o/p stream to a file descriptor...so that whatever is to be printed on to the std o/p goes to that file instead.. will exec 5<&1 work? and then after the work is done, how would i restore things back so that the std o/p again goes to the screen? thanx in anticipation Mayank
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