SYNOPSIS

tscat option [label]

DESCRIPTION

tscat: timestamp stdin to stdout/stderr

tscat timestamps standard input and writes the output to standard output, standard error or both.

EXAMPLES

$ echo test | tscat
2020-10-11T07:09:13-0400 test

$ echo test | tscat foo
2020-10-11T07:09:15-0400 foo test

# duplicate output to stdout/stderr
$ echo test | tscat -o 3 foo
2020-10-11T07:09:15-0400 foo 2020-10-11T07:09:15-0400 foo test
test

$ echo test | tscat -o 3 foo > /dev/null
2020-10-11T07:09:15-0400 foo test

$ echo test | tscat -o 3 foo 2> /dev/null
2020-10-11T07:09:15-0400 foo test

Build

make

# selecting process restrictions
RESTRICT_PROCESS=seccomp make

#### using musl
RESTRICT_PROCESS=rlimit ./musl-make

## linux seccomp sandbox: requires kernel headers

# clone the kernel headers somewhere
export MUSL_INCLUDE=/tmp
git clone https://github.com/sabotage-linux/kernel-headers.git $MUSL_INCLUDE/kernel-headers

# then compile
./musl-make clean all

OPTIONS

-o, --output 1|2|3 : stdout=1, stderr=2, both=3 (default: 1)

-f, --format fmt : timestamp format (see strftime(3)) (default: %F%T%z)

-W, --write-error exit|drop|block : behaviour if write buffer is full (default: block)

-h, --help : usage summary

ALTERNATIVES

#!/bin/sh

LABEL="${1-""}"
exec awk -v service="$LABEL" '{
  t = strftime("%FT%T%z")
  printf("%s %s %s\n", t, service, $0) > "/dev/stderr"
  printf("%s %s %s\n", t, service, $0)
  fflush()
}'

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