stderr

问题 This is a follow up question for write to output stream and returning value from shell script function. In shell script, echo can be used to return values from functions. But, if those functions want to print some messages. Then, this can be done by redirecting it to error stream. But when the script is used as a autosys job. then messages from logic functions ends up in error stream file triggering alerts. Is there any way, messages from logic function can be written to output stream and not

问题 In shell script, echo can be used to return values from functions. But, if those functions want to print some messages. Then, this can be done by redirecting it to error stream. Below is a simplified example :- #this is a function that returns a value, as well as #print some messages function logic(){ echo >&2 "start of logic" echo >&2 "perform logic, to get value" echo "ok" } function smain(){ local result=$(logic) echo "result is >$result<" if [ "$result" == "ok" ];then echo "script

问题 In shell script, echo can be used to return values from functions. But, if those functions want to print some messages. Then, this can be done by redirecting it to error stream. Below is a simplified example :- #this is a function that returns a value, as well as #print some messages function logic(){ echo >&2 "start of logic" echo >&2 "perform logic, to get value" echo "ok" } function smain(){ local result=$(logic) echo "result is >$result<" if [ "$result" == "ok" ];then echo "script

问题 I would need to output the output of a command on a file. Let's say my command is zip -r zip.zip directory , I would need to append/write (any of these options would be fine) to a file (let's say out.txt ). I got zip zip.zip directory | tee -a out.txt so far, but it doesn't seem to work, it just writes the whole output when the command is over... How can I achieve this? Thanks ;) 回答1: Background (ie. Why?) Redirections are immediate -- when you run somecommand | tee -a out.txt , somecommand

问题 I have a script that I am using to automatically sync various remote git repositories. One thing I am trying to do with my scripts is to capture the output of stderr from every command and write all those errors into a text file that is then emailed to me after the script has finished. This will alert me to any problems that I need to fix. I am having a problem with the following two lines though: { git fetch --prune-tags github-fetch master git push github master } 2> '/tmp/stderr-contents

问题 I have a script that I am using to automatically sync various remote git repositories. One thing I am trying to do with my scripts is to capture the output of stderr from every command and write all those errors into a text file that is then emailed to me after the script has finished. This will alert me to any problems that I need to fix. I am having a problem with the following two lines though: { git fetch --prune-tags github-fetch master git push github master } 2> '/tmp/stderr-contents

问题 (Gradle 3.2.1) I run some java tests, which logs output in Stderr/Stdout. I can see that output, if I start gradle test --info but in that case, much of unwanted output from 3-rd party libraries is there too. Documentation suggests using logging.caputureStandardError / logging.caputureStandardError (loglevel) , but it doesn't seem to have any effect. tasks.withType(Test) { logging.captureStandardOutput LogLevel.QUIET logging.captureStandardError LogLevel.QUIET } Then if running gradle test ,

问题 (Gradle 3.2.1) I run some java tests, which logs output in Stderr/Stdout. I can see that output, if I start gradle test --info but in that case, much of unwanted output from 3-rd party libraries is there too. Documentation suggests using logging.caputureStandardError / logging.caputureStandardError (loglevel) , but it doesn't seem to have any effect. tasks.withType(Test) { logging.captureStandardOutput LogLevel.QUIET logging.captureStandardError LogLevel.QUIET } Then if running gradle test ,

问题 I want to have all stdout + stderr in one log file and simultaneously just stderr in another. How can I achieve this in R? Messages must keep the chronological order of all messages in both logs, for example say I have this code: options(warn = 1) cat("1st stdout\n") warning("2nd stderr") cat("3rd stdout\n") warning("4th stderr") How to make it redirect to both logs in the desired way? My thought that it could be simple if it was possible to merge and split the R connections, see the question

问题 I want to have all stdout + stderr in one log file and simultaneously just stderr in another. How can I achieve this in R? Messages must keep the chronological order of all messages in both logs, for example say I have this code: options(warn = 1) cat("1st stdout\n") warning("2nd stderr") cat("3rd stdout\n") warning("4th stderr") How to make it redirect to both logs in the desired way? My thought that it could be simple if it was possible to merge and split the R connections, see the question