Unix Commands I Wish I’d Discovered Years Earlier(spin.atomicobject.com)

  for host in h-abc h-def h-ghi h-jkl h-mno h-pqr h-stu h-vwx h-yza; 
    do 
    ssh -l root $host "hostname; echo "1.1.1.1 server" >> /etc/hosts"; 
  done

  % (cd /foo; tar cpf - .) | ssh bar \(cd /baz\; tar xpf -\)

  % cat ~/.ssh/id_rsa.pub | ssh bar tee -a .ssh/authorized_keys

    xclip -o -selection clipboard

  # Deflection    Col-Force       Beam-Force 
  0.000              0              0    
  0.001            104             51
  0.002            202            101
  0.003            298            148
  0.0031           104            149
  0.004            289            201
  0.0041           291            209
  0.005            104            250
  0.010            311            260
  0.020            104            240
  

  $ cat data.txt | grep -v '#' | awk '{print $2}' | sort | uniq -c
      1 0
      4 104
      1 202
      1 289
      1 291
      1 298
      1 311

  $ time (find OSS/llvm -type f -or -type l | wc -l)
  real	0m4.681s
  $ time du -d0 OSS/llvm
  real	0m4.863s
  $ time ./fts OSS/llvm
  real	0m0.559s

  imac:~
  $ time find . | wc -l
  419191

  real	0m37.865s
  user	0m0.385s
  sys	0m2.611s
  imac:~
  $ time find . | wc -l
  419195

  real	0m10.503s
  user	0m0.330s
  sys	0m1.430s

    $ locate $PWD | wc -l

  % cal 2 1972 | tail +3 | wc -w
      29

  alias d='[ ${#DIRSTACK[@]} -gt 0 ] && for i in `jot ${#DIRSTACK[@]} 1 ${#DIRSTACK[@]} 1`; do echo ${DIRSTACK[$i-1]}; done; echo $PWD'
  alias popd='[ ${#DIRSTACK[@]} -gt 0 ] && { cd "${DIRSTACK[${#DIRSTACK[@]}-1]}"; unset DIRSTACK[${#DIRSTACK[@]}-1]; }; d'
  alias pushd='DIRSTACK[${#DIRSTACK[@]}]="$PWD"; cd'

    $ man xxd | grep vi
       Use xxd as a filter within an editor such as vim(1) to hexdump a	region
       Use xxd as a filter within an editor such as vim(1) to recover a	binary
       Use xxd as a filter within an editor such as vim(1) to recover one line

    set -o vi

  for i in `\ls /bin/* /sbin/* /usr/bin/* /usr/sbin/* | sort -u` ; do ldd $i 2>/dev/null | grep -q curses && whatis `basename $i` ; done | grep -v 'nothing appropriate'

  pwillis@zippy:~$ which df
  /usr/bin/df
  pwillis@zippy:~$ which mount
  /bin/mount

  pwillis@zippy:~$ which ifconfig
  which: no ifconfig in (/usr/local/bin:/usr/bin:/bin:/usr/games:/usr/lib64/kde4/libexec:/usr/kerberos/bin:/usr/lib64/java/bin:/usr/lib64/java/jre/bin:/usr/lib64/qt/bin:/usr/share/texmf/bin:.)
  pwillis@zippy:~$ whereis ifconfig
  ifconfig: /sbin/ifconfig /usr/man/man8/ifconfig.8.gz /usr/share/man/man8/ifconfig.8.gz /usr/X11/man/man8/ifconfig.8.gz

  cp file{,.bak}