What kind of shell lets you set an environment variable like that? With sh you need to export it or set it on the command line.
I thought that if you did not export an "environment variable" when you change its value, then the change is only local, that is, the change is only seen within the process that performed that change. Since I execute the top command inside the process that set CPULOOP=1, I would have thought that top would see this new value.
Is this not the way that unix shells typically work? If not, then my experience with normal languages' scoping rules has led me astray.
Note that even if I do
Code:
export CPULOOP=1
top -b -n 1 -U $USER
I still get an error exit code, so I will still file a bug report.
I thought that if you did not export an "environment variable" when you change its value, then the change is only local, that is, the change is only seen within the process that performed that change.
Precisely correct... "only...the process".
Quote:
Originally Posted by fabulous2
Since I execute the top command inside the process that set CPULOOP=1, I would have thought that top would see this new value.
top is not a command built-in to the shell. The shell must fork() a copy of itself and then that copy must exec() the top command. During the exec, the code for top, in effect, overlays the code for the shell. But a very few things are saved and environment variables are one. Regular variables are not saved.
Meanwhile the parent shell is waiting for its child process to finish. It continues to know that CPULOOP is 1. When you put an & on the end on the line, the parent shell does not wait.. it just keeps going.
Hi Folks -
I'm encountering an issue:
Scenario:
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Hello,
This porblem bugged me for some time. It is to merge different files of hundred rows to have a union with the ID as key column (kind of similar to join!) and absence with 0.
ID File1
A 1
C 3
D 4
M 6
ID File2
A 5
B 10
C 15
Z 26
ID File3
A 2
B 6
O 20
X 9
I want the output... (9 Replies)
Hi,
I am running following command: top -p <psid> | grep used
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I have done a script and IT WORKS JUST PERFECT from command line...but in cron it has problems executing...
nawk -F"|" '
{ s=substr($104,2,18)}
{b ++s}
END { for (i in b) print i, b } ' $1 > /path/to/files/TranId_w$2
q=`cat /path/to/files/TranId_w$2 | wc -l`
echo $q >... (1 Reply)
I'm receiving an exit code 64 in our batch scheduler (BMC product control-m) executing a PERL script on UX-HP. Can you tell me where I can find a list of exit codes and their meaning. I'm assuming the exit code is from the Unix operating system not PERL. (3 Replies)
Hi,
I am working on Solaris 8 and the "intro" man page says, "Upon termination, each command returns two bytes of status, one supplied by the system and given the cause for termination, and (in the case of 'normal' termination) one supplied by the program. The former byte is 0 for normal... (2 Replies)
