CODEWITHSUNDEEP
shelltcl
Bryan
Bryan

Reputation: 339

how to bypass "child process exited abnormally"

I was trying to execute the following 2 lines as Tcl scripts. As keyword1 sometimes doesn't exist in file1, grep returns status code 1, which exec treats as error and stops execute the second line. How do I force it run both lines no matter there is a match or not. 

exec grep keyword_1 file_1 > report_1
exec grep keyword_2 file_2 > report_2

Upvotes: 0

Views: 7249

Answers (2)

glenn jackman
glenn jackman

Reputation: 247142

You could ignore grep's exit status like this:

exec sh -c {grep keyword_1 file_1 > report_1; true}
exec sh -c {grep keyword_2 file_2 > report_2; true}

but, probably better to use catch as @Dinesh suggests

Or use try if you have a modern Tcl

try {exec grep keyword_1 file_1 > report_1} trap CHILDSTATUS {} {}
try {exec grep keyword_2 file_2 > report_2} trap CHILDSTATUS {} {}

Upvotes: 2

Dinesh
Dinesh

Reputation: 16436

You can catch the exceptions using catch command.

if {[catch {exec grep keyword_1 file_1 > report_1} result]} {
    puts "problem in executing grep on file1"
    puts "Reason : $result"
}
if {[catch {exec grep keyword_2 file_2 > report_2} result]} {
    puts "problem in executing grep on file2"
    puts "Reason : $result"
}

If you dont care status of the command which you are executing or the error messages, then it can be written simply as,

catch {exec grep keyword_1 file_1 > report_1}
catch {exec grep keyword_2 file_2 > report_2}

Reference : catch

Upvotes: 3

Related Questions