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Unix command to prepend text to a file
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printf '%s\n%s\n' "to be prepended" "$(cat text.txt)" >text.txt
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Is there replacement for cat on Windows
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Windows type command works similarly to UNIX cat.
Example 1:
type file1 file2 > file3
is equivalent of:
cat file1 file2 > file3
Example 2:
type *.vcf > all_in_one.vcf
This command will merge all the vcards into one.
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How to create a file in Linux from terminal window? [closed]
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Create the file using cat
$ cat > myfile.txt
Now, just type whatever you want in the file:
Hello World!
CTRL-D to save and exit
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conversion from string to json object android
I am working on an Android application. In my app I have to convert a string to Json Object, then parse the values. I checked for a solution in stackoverflow and found similar issue here link
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Number of processors/cores in command line
...d you give is the most portable on Linux. Instead of spawning unnecessary cat and wc processes, you can shorten it a bit:
$ grep --count ^processor /proc/cpuinfo
2
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Difference between \b and \B in regex
...one space further left and right.
On the other hand, when searching for \bcat\b word boundaries behave more intuitively, and it matches " cat " as expected.
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Can I export a variable to the environment from a bash script without sourcing it?
... source or . to execute the script in the context of the calling shell:
$ cat set-vars1.sh
export FOO=BAR
$ . set-vars1.sh
$ echo $FOO
BAR
Another way is to have the script, rather than setting an environment variable, print commands that will set the environment variable:
$ cat set-vars2.sh
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Regex Pattern to Match, Excluding when… / Except between
...er-Known Variation
There is a variation using syntax specific to Perl and PHP that accomplishes the same. You'll see it on SO in the hands of regex masters such as CasimiretHippolyte and HamZa. I'll tell you more about this below, but my focus here is on the general solution that works with all reg...
How can I represent an 'Enum' in Python?
...enum import Enum # for the aenum version
Animal = Enum('Animal', 'ant bee cat dog')
Animal.ant # returns <Animal.ant: 1>
Animal['ant'] # returns <Animal.ant: 1> (string lookup)
Animal.ant.name # returns 'ant' (inverse lookup)
or equivalently:
class Animal(Enum):
ant = 1
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Split string into array of character strings
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"cat".split("(?!^)")
This will produce
array ["c", "a", "t"]
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