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[Solved] <<EOF error checking

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Top Forums Shell Programming and Scripting [Solved] <<EOF error checking
# 1  
Old 11-08-2010
[Solved] <<EOF error checking
I am trying to check the return status of a command thats encapsulated
in an <<EOF

Code:
#!/bin/ksh
set -x
xxx()
{
set -x
ls -lt /tmp/jdlkewjdlkewjdlkewjdlewjdlew<<EOT
ret=$?
EOT
echo "ret=$ret"
} >>$LOG 2>&1

LOG=/tmp/t2.out
rm -rf $LOG
echo "Starting process `date +"%Y-%m-%d-%H:%M:%S"`" >> $LOG
xxx
echo "Ending process `date +"%Y-%m-%d-%H:%M:%S"`" >> $LOG

As you can see from the set -x output (below) this file does not
exist and when I execute $? from the commnad line I get back a non zero.

Can somebody show me how to get back the return status when something is encapulated in <<EOF


Code:
Starting process 2010-11-08-12:39:53
+ ls -lt /tmp/jdlkewjdlkewjdlkewjdlewjdlew
+ 0<<
ret=0
/tmp/jdlkewjdlkewjdlkewjdlewjdlew: No such file or directory
+ echo ret=
ret=
Ending process 2010-11-08-12:39:53

---------- Post updated at 12:52 PM ---------- Previous update was at 12:44 PM ----------

Please ignore I figured it out, placed $? out of EOF
# 2  
Old 11-08-2010
Thanks for letting us know...

All the best
# 3  
Old 11-08-2010
<<EOF just transfers the following lines to a file in /tmp and then redirects stdin (<) to it, so $? is just as valid. It just reads funny with <<EOF on the cmd line (so I use echo '...'|). Here is a truss / tusc of a ksh doing this:
Code:
$ truss -fp ksh -c 'while read l
do
 lsum=$(( $lsum + $l))
done <<! ; echo $? ; echo $lsum
1
2
3
!
'
[22593] execve("/usr/bin/ksh", 0x7b0f11a4, 0x7b0f11b4) ... = 0 [32-bit]
 .
 .
 .
[22593] open("/tmp/sh22593.1", O_RDWR|O_CREAT|O_EXCL, 0600) = 3
[22593] write(3, "1 \n2 \n3 \n", 6) ...................... = 6
[22593] close(3) ......................................... = 0
[22593] fcntl(0, F_DUPFD, 10) ............................ = 10
[22593] fcntl(10, F_GETFD, 0) ............................ = 0
[22593] fcntl(10, F_SETFD, 1) ............................ = 0
[22593] open("/tmp/sh22593.1", O_RDONLY|O_LARGEFILE, 01) . = 3
[22593] fcntl(0, F_GETFD, 0) ............................. = 0
[22593] close(0) ......................................... = 0
[22593] fcntl(3, F_DUPFD, 0) ............................. = 0
[22593] close(3) ......................................... = 0
[22593] sigprocmask(SIG_BLOCK, 0x7b0f2c20, 0x7b0f2c00) ... = 0
[22593] sigprocmask(SIG_SETMASK, 0x7b0f2c00, NULL) ....... = 0
[22593] fcntl(0, F_GETFL, 0) ............................. = 2048
[22593] lseek(0, 0, SEEK_CUR) ............................ = 0
[22593] ioctl(0, TCGETATTR, 0x40004b90) .................. ERR#25 ENOTTY
[22593] sigprocmask(SIG_BLOCK, 0x7b0f2b60, 0x7b0f2b40) ... = 0
[22593] read(0, "1 \n2 \n3 \n", 1024) .................... = 6
 .
 .
 .
[22593] read(0, 0x400059b0, 1024) ........................ = 0
 .
 .
 .
[22593] fcntl(0, F_GETFD, 0) ............................. = 0
[22593] close(0) ......................................... = 0
[22593] fcntl(10, F_DUPFD, 0) ............................ = 0
[22593] close(10) ........................................ = 0
[22593] fcntl(0, F_SETFD, 0) ............................. = 0
[22593] unlink("/tmp/sh22593.1") ......................... = 0
[22593] sigprocmask(SIG_BLOCK, 0x7b0f15a0, 0x7b0f1580) ... = 0
[22593] sigprocmask(SIG_SETMASK, 0x7b0f1580, NULL) ....... = 0
0
6
[22593] write(1, "0 \n6 \n", 4) .......................... = 4
[22593] exit(0) .......................................... WIFEXITED(0)
$

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