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Unix command to find lines common in two files
...sion 3.2.51(1)-release
Copyright (C) 2007 Free Software Foundation, Inc.
$ cat > abc
123
567
132
$ cat > def
132
777
321
So the files abc and def have one line in common, the one with "132".
Using comm on unsorted files:
$ comm abc def
123
132
567
132
777
321
$ comm -12 abc def ...
What's the difference between a catalog and a schema in a relational database?
...
From the relational point of view :
The catalog is the place where--among other things--all of the various schemas (external, conceptual, internal) and all of the corresponding mappings (external/conceptual, conceptual/internal) are kept.
In other words, the ...
How do I make a Git commit in the past?
...se git add, but you would first need to copy the file from some external location to the expected path (--index-filter runs its command in a temporary GIT_WORK_TREE that is empty).
If you want your new file to be added to every existing commit, then you can do this:
new_file=$(git hash-object -w p...
Copying files from host to Docker container
...rly ugly way of doing it but it works.
docker run -i ubuntu /bin/bash -c 'cat > file' < file
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What's the difference between UTF-8 and UTF-8 without BOM?
...is ok), then some quotation mark without space in-between (not ok). ¿ indicates it is Spanish but ï is not used in Spanish. Conclusion: It is not latin-1 with a certainty well above the certainty without it.
– user877329
Nov 5 '13 at 7:20
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How to detect if a script is being sourced
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Additional tests could be included to check for those invocation methods.
– Paused until further notice.
Feb 19 '13 at 1:33
8
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How to install packages using pip according to the requirements.txt file from a local directory?
... requirements.txt file.
cd to the directory where requirements.txt is located
activate your virtualenv
run: pip install -r requirements.txt in your shell
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string.charAt(x) or string[x]?
...n a string. The first is the charAt method, part of ECMAScript 3:
return 'cat'.charAt(1); // returns "a"
The other way is to treat the string as an array-like object, where each individual characters correspond to a numerical index. This has been supported by most browsers since their first v...
Passing argument to alias in bash [duplicate]
...his is the solution which can avoid using function:
alias addone='{ num=$(cat -); echo "input: $num"; echo "result:$(($num+1))"; }<<<'
test result
addone 200
input: 200
result:201
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How to display long messages in logcat
I am trying to display long message on logcat. If the length of message is more than 1000 characters, it gets broken.
10 A...