$ echo -e "\xF0\x9F\x98\x80"
Result:
😀
Command:
$ echo -n 😀 | hexdump
Result:
0000000 f0 9f 98 80
0000004
Wednesday, September 7, 2016
Emoji: Converting from and to UTF-8 Hexadecimal
Command:
$ echo -e "\xF0\x9F\x98\x80"
Result:
😀
Command:
$ echo -n 😀 | hexdump
Result:
0000000 f0 9f 98 80
0000004
$ echo -e "\xF0\x9F\x98\x80"
Result:
😀
Command:
$ echo -n 😀 | hexdump
Result:
0000000 f0 9f 98 80
0000004
GNU Fortran: Hello World
Command:
$ cat myfile.f90
program hello
print *, "Hello World!"
end program hello
Result:
$ gfortran myfile.f90 -o myfile
$ ./myfile
Hello World!
Command:
$ cat myfile.f
Result:
program hello
print *, "Hello World!"
end program hello
Command:
$ gfortran myfile.f -o myfile
Result:
myfile.f:1:1:
program hello
1
Error: Non-numeric character in statement label at (1)
myfile.f:1:1:
program hello
1
Error: Unclassifiable statement at (1)
myfile.f:2:1:
print *, "Hello World!"
1
Error: Non-numeric character in statement label at (1)
myfile.f:2:1:
print *, "Hello World!"
1
Error: Unclassifiable statement at (1)
myfile.f:3:1:
end program hello
1
Error: Non-numeric character in statement label at (1)
myfile.f:3:1:
end program hello
1
Error: Unclassifiable statement at (1)
$ cat myfile.f90
program hello
print *, "Hello World!"
end program hello
Result:
$ gfortran myfile.f90 -o myfile
$ ./myfile
Hello World!
Syntax error because of the file extension
Command:
$ cat myfile.f
Result:
program hello
print *, "Hello World!"
end program hello
Command:
$ gfortran myfile.f -o myfile
Result:
myfile.f:1:1:
program hello
1
Error: Non-numeric character in statement label at (1)
myfile.f:1:1:
program hello
1
Error: Unclassifiable statement at (1)
myfile.f:2:1:
print *, "Hello World!"
1
Error: Non-numeric character in statement label at (1)
myfile.f:2:1:
print *, "Hello World!"
1
Error: Unclassifiable statement at (1)
myfile.f:3:1:
end program hello
1
Error: Non-numeric character in statement label at (1)
myfile.f:3:1:
end program hello
1
Error: Unclassifiable statement at (1)
OS X: GNU Fortran
Command:
$ brew install gfortran
Result:
Error: No available formula with the name "gfortran"
GNU Fortran is now provided as part of GCC, and can be installed with:
brew install gcc
Command:
$ gfortran --version
Result:
GNU Fortran (Homebrew gcc 5.3.0) 5.3.0
Copyright (C) 2015 Free Software Foundation, Inc.
GNU Fortran comes with NO WARRANTY, to the extent permitted by law.
You may redistribute copies of GNU Fortran
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING
OS X: Installing Clozure CL
Command:
$ brew install clozure-cl
Result:
==> Downloading http://ccl.clozure.com/ftp/pub/release/1.11/ccl-1.11-darwinx86.tar.gz
######################################################################## 100.0%
🍺 /usr/local/Cellar/clozure-cl/1.11: 1,568 files, 178.5M, built in 1 minute 46 seconds
$ ccl --version
Version 1.11-r16635 (DarwinX8632)
$ brew install clozure-cl
Result:
==> Downloading http://ccl.clozure.com/ftp/pub/release/1.11/ccl-1.11-darwinx86.tar.gz
######################################################################## 100.0%
🍺 /usr/local/Cellar/clozure-cl/1.11: 1,568 files, 178.5M, built in 1 minute 46 seconds
$ ccl --version
Version 1.11-r16635 (DarwinX8632)
Tuesday, September 6, 2016
Crontab: Tweet Random Line without Modulo Bias
Command:
$ crontab -l
Result:
*/30 * * * * perl -le 'sleep rand 360' && csv="list.csv"; wc=$[`wc -l < $csv` - 1]; rand=$[`./rand_nobias.sh $wc`]; head -$[$[$rand \% $wc] + 2] $csv | tail -1 | /usr/local/bin/gawk -f formatcsv.awk | ruby tweet.rb
Bourne shell: Generating Random Number without Modulo Bias
Command:
$ cat rand_nobias.sh
Result:
#!/bin/sh
$ cat rand_nobias.sh
Result:
#!/bin/sh
numlines=$1;
randmax=32767;
max=$((($randmax/$numlines)*$numlines));
rand=$RANDOM;
until [ $rand -lt $max ]
do
rand=$RANDOM;
done
echo $rand;
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