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Start your bash script with bash -x ./script.sh or add in your script set -x to see debug output.

Additional with bash 4.1 or later:

If you want to write the debug output to a separate file, add this to your script:

exec 5> debug_output.txt BASH_XTRACEFD="5" 

See: http://stackoverflow.com/a/25593226/3776858

If you want to see line numbers add this:

PS4='$LINENO: ' 

#!/bin/bash exec 5> >(logger -t $0) BASH_XTRACEFD="5" PS4='$LINENO: ' set -x # Place your code here 

You can use option -p of logger command to set an individual facility and level to write output via local syslog to its own logfile.

Start your bash script with bash -x ./script.sh or add in your script set -x to see debug output.

Additional with bash 4.1 or later:

If you want to write the debug output to a separate file, add this to your script:

exec 5> debug_output.txt BASH_XTRACEFD="5" 

See: https://stackoverflow.com/a/25593226/3776858

If you want to see line numbers add this:

PS4='$LINENO: ' 

#!/bin/bash exec 5> >(logger -t $0) BASH_XTRACEFD="5" PS4='$LINENO: ' set -x # Place your code here 

You can use option -p of logger command to set an individual facility and level to write output via local syslog to its own logfile.

Start your bash script with bash -x ./script.sh or add in your script set -x to see debug output.

Additional with bash 4.1 or later:

If you want to write the debug output to a separate file, add this to your script:

exec 5> debug_output.txt BASH_XTRACEFD="5" 

See: http://stackoverflow.com/a/25593226/3776858

If you want to see line numbers add this:

PS4='$LINENO: ' 

#!/bin/bash exec 5> >(logger -t $0) BASH_XTRACEFD="5" PS4='$LINENO: ' set -x # Place your code here 

You can use option -p of logger command to set an individual facility.level pair to write output via local syslog to its own logfile.

Start your bash script with bash -x ./script.sh or add in your script set -x to see debug output.

Additional with bash 4.1 or later:

If you want to write the debug output to a separate file, add this to your script:

exec 5> debug_output.txt BASH_XTRACEFD="5" 

See: http://stackoverflow.com/a/25593226/3776858

If you want to see line numbers add this:

PS4='$LINENO: ' 

#!/bin/bash exec 5> >(logger -t $0) BASH_XTRACEFD="5" PS4='$LINENO: ' set -x # Place your code here 

You can use option -p of logger command to set an individual facility and level to write output via local syslog to its own logfile.

Start your bash script with bash -x ./script.sh or add in your script set -x.

Additional with bash 4.1 or later:

If you want to write the debug output to a separate file, add this to your script:

exec 5> debug_output.txt BASH_XTRACEFD="5" 

See: http://stackoverflow.com/a/25593226/3776858

If you want to see line numbers add this:

PS4='$LINENO: ' 

#!/bin/bash exec 5> >(logger -t $0) BASH_XTRACEFD="5" PS4='$LINENO: ' set -x # Place your code here 

You can use option -p of logger command to set an individual facility.level pair to write output via local syslog to its own logfile.

Start your bash script with bash -x ./script.sh or add in your script set -x to see debug output.

Additional with bash 4.1 or later:

If you want to write the debug output to a separate file, add this to your script:

exec 5> debug_output.txt BASH_XTRACEFD="5" 

See: http://stackoverflow.com/a/25593226/3776858

If you want to see line numbers add this:

PS4='$LINENO: ' 

#!/bin/bash exec 5> >(logger -t $0) BASH_XTRACEFD="5" PS4='$LINENO: ' set -x # Place your code here 

You can use option -p of logger command to set an individual facility.level pair to write output via local syslog to its own logfile.