root@client:/home/created_channels# ffmpeg -f concat -i <(for i in {1..4}; do echo "file 15_1.avi\n"; done) -c copy -f mpegts /tmp/test.ts

ffmpeg version N-72570-gf104970 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  configuration: --prefix=/root/FFmpeg/target --extra-cflags='-I/root/FFmpeg/target/include -static' --extra-ldflags='-L/root/FFmpeg/target/lib -lm -static' --disable-debug --disable-shared --enable-libx265 --enable-static --extra-cflags=--static --disable-ffplay --disable-ffserver --disable-doc --enable-gpl --enable-pthreads --enable-postproc --enable-libass --enable-gray --enable-runtime-cpudetect --enable-gnutls --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-bzlib --enable-zlib --enable-version3 --enable-libvpx --enable-libxavs --disable-devices --enable-librtmp --extra-libs='-lrtmp -lnettle -lhogweed -lgmp -lssl -lcrypto -lz -lc -ldl'
  libavutil      54. 26.101 / 54. 26.101
  libavcodec     56. 41.101 / 56. 41.101
  libavformat    56. 34.100 / 56. 34.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 16.101 /  5. 16.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
/dev/fd/63: No such file or directory