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Comparing two files in linux terminal
... --unchanged-group-format="" file1.txt file2.txt
[root@vmoracle11 tmp]# cat file1.txt
test one
test two
test three
test four
test eight
[root@vmoracle11 tmp]# cat file2.txt
test one
test three
test nine
[root@vmoracle11 tmp]# diff --changed-group-format='%<' --unchanged-group-format='' file1...
How does git compute file hashes?
...o substitute CRLFs by LFs
# by using `perl -pe 's/\r$//g'` instead of `cat` in the next 2 commands
local size=$(cat $1 | wc -c | sed 's/ .*$//')
( echo -en "$type $size\0"; cat "$1" ) | sha1sum | sed 's/ .*$//'
}
Test:
$ echo 'Hello, World!' > test.txt
$ git hash-object test.txt
8a...
What is __main__.py?
...ython -m my_program
You'll have to decide for yourself whether your application could benefit from being executed like this.
Note that a __main__ module usually doesn't come from a __main__.py file. It can, but it usually doesn't. When you run a script like python my_program.py, the script will...
Shell script to send email [duplicate]
...les too:
mail -s "Hello world" you@youremailid.com < /home/calvin/application.log
mail doesn't support the sending of attachments, but Mutt does:
echo "Sending an attachment." | mutt -a file.zip -s "attachment" target@email.com
Note that Mutt's much more complete than mail.
You can find bet...
How do I make CMake output into a 'bin' dir?
...
$ cat CMakeLists.txt
project (hello)
set(EXECUTABLE_OUTPUT_PATH "bin")
add_executable (hello hello.c)
share
|
improve this a...
Shuffling a list of objects
...[2, 1, 3, 4, 0] two list same: False
# The function sample allows no duplicates.
# Result can be smaller but not larger than the input.
a = range(555)
b = random.sample(a, len(a))
print "no duplicates:", a == list(set(b))
try:
random.sample(a, len(a) + 1)
except ValueError as e:
print "Nop...
Hook up Raspberry Pi via Ethernet to laptop without router? [closed]
... potentially recover the Raspberry Pi, it will most likely be in a rural location and I'd like to turn off the Pi at that point safely.
...
What is the difference between exit(0) and exit(1) in C?
... is the difference between exit(0) and exit(1) in C language?
exit(0) indicates successful program termination & it is fully portable, While
exit(1) (usually) indicates unsucessful termination. However, it's usage is non-portable.
Note that the C standard defines EXIT_SUCCESS and EXIT_FAILURE ...
What does 'predicate' mean in the context of computer science? [duplicate]
...cifically I've seen it used in the context of text filtering. As if "predicate" == "filter criteria".
7 Answers
...
Abort makefile if variable not set
... exists in the root
# directory, e.g. left by an accidental `make -t` invocation.
.PHONY : __check_defined_FORCE
__check_defined_FORCE :
Usage:
foo :|check-defined-BAR
Notice that the check-defined-BAR is listed as the order-only (|...) prerequisite.
Pros:
(arguably) a more clean syntax
...