js

console.log([5, -9].map(Number))

[ 5, -9 ]

js

console.log(process.env);

{ MAILTO: '',
  LANG: 'en_US.UTF-8',
  SHELL: '/bin/sh',
  NODE_PATH: '/usr/local/lib/node_modules/',
  PWD: '/root',
  LOGNAME: 'rextester_user323',
  USER: 'rextester_user323',
  HOME: '/home/rextester_user323',
  PATH: '/usr/bin:/bin' }

js

console.log(process.versions)

{ http_parser: '2.7.1',
  node: '8.10.0',
  v8: '6.2.414.50',
  uv: '1.18.0',
  zlib: '1.2.11',
  ares: '1.14.0',
  modules: '57',
  nghttp2: '1.30.0',
  openssl: '1.0.2n',
  icu: '60.2',
  unicode: '10.0',
  cldr: '32.0.1',
  tz: '2017c' }

js

console.log(process.config)

{ target_defaults: 
   { cflags: [],
     default_configuration: 'Release',
     defines: [ 'NODE_OPENSSL_CERT_STORE' ],
     include_dirs: [],
     libraries: 
      [ '-lz',
        '-lhttp_parser',
        '-luv',
        '-lcares',
        '-lnghttp2',
        '-lcrypto',
        '-lssl',
        '-licui18n',
        '-licuuc',
        '-licudata' ] },
  variables: 
   { asan: 0,
     coverage: false,
     debug_devtools: 'node',
     debug_http2: false,
     debug_nghttp2: false,
     force_dynamic_crt: 0,
     host_arch: 'x64',
     icu_gyp_path: 'tools/icu/icu-system.gyp',
     icu_small: false,
     llvm_version: 0,
     node_byteorder: 'little',
     node_enable_d8: false,
     node_enable_v8_vtunejit: false,
     node_install_npm: false,
     node_module_version: 57,
     node_no_browser_globals: false,
     node_prefix: '/usr',
     node_release_urlbase: '',
     node_shared: false,
     node_shared_cares: true,
     node_shared_http_parser: true,
     node_shared_libuv: true,
     node_shared_nghttp2: true,
     node_shared_openssl: true,
     node_shared_zlib: true,
     node_tag: '',
     node_use_bundled_v8: true,
     node_use_dtrace: false,
     node_use_etw: false,
     node_use_lttng: false,
     node_use_openssl: true,
     node_use_perfctr: false,
     node_use_v8_platform: true,
     node_without_node_options: false,
     openssl_fips: '',
     openssl_no_asm: 0,
     shlib_suffix: 'so.57',
     target_arch: 'x64',
     uv_parent_path: '/deps/uv/',
     uv_use_dtrace: false,
     v8_enable_gdbjit: 0,
     v8_enable_i18n_support: 1,
     v8_enable_inspector: 1,
     v8_no_strict_aliasing: 1,
     v8_optimized_debug: 0,
     v8_promise_internal_field_count: 1,
     v8_random_seed: 0,
     v8_trace_maps: 0,
     v8_use_snapshot: false,
     want_separate_host_toolset: 0 } }

js

const { exec } = require('child_process');
exec('cat *.js bad_file | wc -l', (error, stdout, stderr) => {
  if (error) {
    console.error(`exec error: ${error}`);
    return;
  }
  console.log(`stdout: ${stdout}`);
  console.log(`stderr: ${stderr}`);
});

stdout: 0

stderr: cat: '*.js': No such file or directory
cat: bad_file: No such file or directory

js

const { exec } = require('child_process');
exec('ls ', (error, stdout, stderr) => {
  console.log(`stdout: ${stdout}`);
  console.log(`stderr: ${stderr}`);
});

stdout: 1006848033
1053889352
1061163835
1063333467
110092123
1136963581
1146417914
115755696
118043393
1188611293
119455263
1219130755
125329366
1258989966
1300786646
1351618537
1452464644
1488289217
1509413385
154957195
1555038904
1577024135
1584608744
159049353
1631295256
1631645588
1649318816
1664030104
1670751591
1712227687
1715709932
1725953282
1734773351
1759848567
1769774804
1795342038
1800755347
1801690903
1837409024
1899136018
1922489183
1932474907
1932765787
1960963405
203138881
2051763930
2062007925
2071344289
2076297431
2104531058
2136236339
2140599537
241935803
243821915
252749810
308913560
315316206
329283802
344339193
359302588
368987641
379042324
379254260
422536773
423093608
43083176
436073653
443316128
459468699
459541639
468730775
490573354
518030752
602505654
650860080
673455147
680899861
685673376
723240367
755604839
761895508
783911082
837193862
851764331
927651459
934680253
961653287
996558710
998764513

stderr:

js

const { exec } = require('child_process');
exec('ls -al ..', (error, stdout) => {
  console.log(stdout);
});

total 24
drwxrwxr-x  3 root ren  4096 May 21 16:27 .
drwxrwxr-x  4 ren  ren  4096 Feb 18 23:15 ..
-rwxr-----  1 root root 1334 Apr 25 18:08 compile_parent.py
-rwxrw----  1 ren  ren  4570 May 21 16:27 parent.py
drwxr-xr-x 91 root root 4096 May 30 14:48 usercode

js

const { exec } = require('child_process');
exec('whoami', (error, stdout) => {
  console.log(stdout);
});

rextester_user410

js

const result = Math.min() < Math.max();