How to Calculate Execution Time and Get Command Exit Code-CodePudding

I write a shell script and I want to get execution time of a command but I also redirect output of command to a file. Also, I need to get exit code of this specific command to use it in if statement. Here is what I have tried:

...
TIMEFORMAT=%R

log_file() {
  echo "$PROJECT_DIR/logs/$1_$(date  %Y%m%d_%H%M%S).log"
}    

CODE_TIME=$(time sh -c "ipython -c "%run ./foo.ipynb" > $(log_file "log_file_name") 2>&1")

CODE_RESULT=$?

echo "Code_Result: $CODE_RESULT"

if [ "$CODE_RESULT" -eq 0 ]

    ...

According to documentation of time, it returns the exit code of the command but I also execute an echo command in function. So, anyone has an idea about how can I get exit code of ipython command? Thanks.

CodePudding user response：

Your quoting in your sample call is unusual. I would expect that

sh -c "ipython -c "%run ./foo.ipynb" > $(log_file "log_file_name") 2>&1"

is translated to

sh -c 'ipython -c %run' './foo.ipynb > somewhere/logs/log_file_name_somedate.log 2>&1'

As for the behaviour of time wrt return codes, my bash (5.1.16) behaves like this:

$ time ls "I do not exist" > $(echo newfile) 2>&1

real    0m0,004s
user    0m0,004s
sys     0m0,000s

$ echo $?
2

$ cat newfile
"I do not exist": No such file or directory (os error 2)

And wrt to redirections like this:

$ capture="$(time (ls "I do not exist" > $(echo newfile2) 2>&1) 2>&1)"

$ echo $?
2

$ echo "$capture"

real    0m0,004s
user    0m0,004s
sys     0m0,000s

$ cat newfile2
"I do not exist": No such file or directory (os error 2)

Therefore, I'd suggest you to try changing your call to:

CODE_TIME="$(time (sh -c "ipython -c '%run ./foo.ipynb' > $(log_file "log_file_name") 2>&1") 2>&1)"

CODE_RESULT=$?