ANDing exit codes in bash -


i have bash script runs 3 checks on source code, , exit 0 if commands succeeded, or exit 1 if of them failed:

#!/bin/bash  test1 ./src/ --test-1=option exit_1=$?  test2 ./src/ test-2-options exit_2=$?  test3 ./src/ -t 3 -o options exit_3=$?  # exit error if of above failed [[ $exit_1 -eq 0 && $exit_2 -eq 0 && $exit_3 -eq 0 ]] exit $?

this code works, feels overly long , verbose. there way can made nicer? not happy with:

  • having run command, , then assign exit code variable
  • having use [[ ... ]], then collect exit code on next line exit with
  • having explicitly compare variables 0, in [[ $var -eq 0 ]], instead of treating them booleans

ideally, end result more readable like:

exit_1=( test1 ./src/ --test-1=option ) exit_2=( test2 ./src/ test-2-options ) exit_3=( test3 ./src/ -t 3 -o options )  # exit error if of above failed exit ( $exit_1 && $exit_2 && $exit_3 )

some things have considered:

getting error code in variable in 1 line:

exit_1=$( test1 ./src/ --test-1=option )$? exit_2=$( test2 ./src/ test-2-options )$? exit_3=$( test3 ./src/ -t 3 -o options )$?

this works, , makes bit shorter, i've never seen else use before. sensible/sane thing do? there issues this?

just running tests, , && them together:

test1 ./src/ --test-1=option && \ test2 ./src/ test-2-options && \ test3 ./src/ -t 3 -o options status=$?

this not work, bash short circuits. if test1 fails, test2 , test3 not run, , want them run.

detecing errors , exiting using || exit

[[ $exit_1 -eq 0 && $exit_2 -eq 0 && $exit_3 -eq 0 ]] || exit 1

this saves 1 line of awkward exit codes , variables, important bit of exit 1 right @ end of line can miss it. ideally, work:

exit [[ $exit_1 -eq 0 && $exit_2 -eq 0 && $exit_3 -eq 0 ]]

of course, not work, [[ returns output instead of echoing it.

exit $( [[ $exit_1 -eq 0 && $exit_2 -eq 0 && $exit_3 -eq 0 ]] ; echo $? )

does work, still seems horrid cludge

not explicitly dealing exit-codes-as-boolean

[[ $exit_1 && $exit_2 && $exit_3 ]]

this not hope do. easiest way of && 3 return codes stored in variables full $var -eq 0 && .... surely there nicer way?

i know bash not nice programming language - if can call - there way can make less awkward?

you can use bash's arithmetic command or exit codes together, , negate result, exit code of 1 if of codes non-zero. first, example:

$ ! (( 0 | 0 | 0 )); echo $? 0 $ ! (( 1 | 0 | 0 )); echo $? 1

now, script:

#!/bin/bash  test1 ./src/ --test-1=option; exit_1=$? test2 ./src/ test-2-options;  exit_2=$?    test3 ./src/ -t 3 -o options; exit_3=$?  # exit error if of above failed. no need final # call exit, if last command in script ! (( $exit_1 || $exit_2 || $exit_3 ))

or in general, can accumulate exit codes run arbitrary number of tests:

#!/bin/bash  # unfortunately, ||= not assignment operator in bash. # use |=, suppose; may not able assign # meaning particular non-zero value, though. test1 ./src/ --test-1=option; (( exit_status = exit_status || $? )) test2 ./src/ test-2-options;  (( exit_status = exit_status || $? ))   test3 ./src/ -t 3 -o options; (( exit_status = exit_status || $? )) # ... testn ./src "${final_option_list[@]}"; (( exit_status = exit_status || $? ))  exit $exit_status   # 0 if succeeded, 1 if failed

Comments

Post a Comment

Popular posts from this blog

php - Why I am getting the Error "Commands out of sync; you can't run this command now" -

the documentation of error mentioned in title says if commands out of sync; can't run command now in client code, calling client functions in wrong order. this can happen, example, if using mysql_use_result() , try execute new query before have called mysql_free_result(). can happen if try execute 2 queries return data without calling mysql_use_result() or mysql_store_result() in between. from here: http://dev.mysql.com/doc/refman/5.0/en/commands-out-of-sync.html but in first query not fetching data mysql database, inserting. , in second query getting data database. here code $connection = mysqli_connect("localhost","username","password","tbl_msgs"); if(mysqli_connect_errno($connection)) { die("failed connect mysql: " . mysqli_connect_error()); } $query = "insert users (total_comments, total_views) values ({$total_comments}, {$total_views});"; $query .= "insert msgs (no...
Read more

linux - Does gcc have any options to add version info in ELF binary file? -

i mean whether gcc can insert source code version infor elf binary section or similar. not want change source file, add info gcc option in makefile. you can emit version info text file, turn text file object file statically link executable. the first step simple have write code: script or write version info in format plain text file. write makefile rule produce version.o version.txt, using objcopy . you'll have object file 2 useful symbols defined in it: beginning , end of textual version info. add generated object executable, , you'll able access version 2 ways: running strings on binary, or writing code in application print version string (you'll need declare start , end symbols variables in header file).
Read more

java - Are there any classes that implement javax.persistence.Parameter<T>? -

i'm using named queries fetch entities database using jpa , hibernate , came across puzzling me: how come there no default implementations of javax.persistence.parameter interface? i rather impressed how @staticmetamodel used criteriabuilder in jpa2 meaning type safety , don't have mess around setting string names. wanted apply similar of jpa1 ejb's i'm working on: dealergroup_.class: public dealergroup_ { public parameter<integer> id = new parameterimpl<integer>("id"); /// etc... } dealergroupfacade.class: // ... public dealergroup fetch(integer id) { typedquery<dealergroup> query = em.createnamedquery("dealergroup.fetchbyid", dealergroup.class); query.setparameter(dealergroup_.id, query); return query.getsingleresult(); } // ... i surprised find there no implementations of parameter interface - of course, implement myself absence makes me suspicious may mistake using in way? should implementing parameter...
Read more