CODEWITHSUNDEEP
bashshell
Onkar Mahajan
Onkar Mahajan

Reputation: 974

Modifying error and log messages on fly

I have a situation wherein I want to send error and log messages to a same file. To distinguish between the error and log messages I am appending the log messages like this :

file would look like this : 

===============log_and_error_msg.txt =========
ERR: This message is an error message
INF: This is a log message

so that anybody interested in error messages can grep "ERR" log_and_error_msg.txt

suppose I am executing some shell script like this 

./shellscript 2>>log_and_error_msg.txt 1>>log_and_error_msg.txt

How do I add ERR and INF on fly to each message on fly ??

Upvotes: 0

Views: 98

Answers (4)

William Pursell
William Pursell

Reputation: 212248

{ { ./shellscript | sed 's/^/INF: /'; } 2>&1 1>&3 | sed 's/^/ERR: /'; } \
>> log_and_error_message.txt 3>&1

Upvotes: 0

Dennis Williamson
Dennis Williamson

Reputation: 360055

#!/bin/bash
exec 3> >(sed 's/^/INF: /' >> prepend.log)
exec 4> >(sed 's/^/ERR: /' >> prepend.log)
echo "some information" >&3
echo "an error" >&4
echo "more information" >&3
echo "this goes to the screen"
echo "this goes to stderr, bypassing the log" >&2
echo "another error" >&4
echo "yet more information" >&3
echo "still information" >&3
echo "oops" >&4

Upvotes: 2

Adam Trhon
Adam Trhon

Reputation: 2935

You can use sed. Insert sed 's/^/TYPE /' in each pipeline, replacing TYPE with ERR: or INF:

Upvotes: 1

Emanuel Landeholm
Emanuel Landeholm

Reputation: 1408

Try redirecting stderr to a temporary file.

./testscript.sh 2> err.tmp | ( while read line ; do echo 'INFO: ' $line ; done ) ; ( while read line ; do echo 'ERR: ' $line ; done ) <err.tmp

Upvotes: 0

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