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Add a prefix string to beginning of each line
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If your prefix is a bit complicated, just put it in a variable:
prefix=path/to/file/
Then, you pass that variable and let awk deal with it:
awk -v prefix="$prefix" '{print prefix $0}' input_file.txt
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Debugging sqlite database on the device
I am presently working on an WiFi application for Android. I am having trouble trying to access the database on the device. Debugging in the emulator doesn't work for me, because there is no WiFi support in the emulator. I tried pulling the database file out of the device by using
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Stop pip from failing on single package when installing with requirements.txt
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Running each line with pip install may be a workaround.
cat requirements.txt | xargs -n 1 pip install
Note: -a parameter is not available under MacOS, so old cat is more portable.
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Solving “Who owns the Zebra” programmatically?
...= "Norwegian German Dane Swede English".split()
pets = "birds dog cats horse zebra".split()
drinks = "tea coffee milk beer water".split()
cigarettes = "Blend, Prince, Blue Master, Dunhill, Pall Mall".split(", ")
# There are five houses.
minn, maxn = 1, 5
problem = Problem()
# val...
Can I see changes before I save my file in Vim?
...his in your vimrc or in the plugin directory, open a file, make some modifications without saving them, and do :DiffSaved.
function! s:DiffWithSaved()
let filetype=&ft
diffthis
vnew | r # | normal! 1Gdd
diffthis
exe "setlocal bt=nofile bh=wipe nobl noswf ro ft=" . filetype
endfunction...
How to get full path of a file?
...nd it...
jcomeau@intrepid:~$ python -c 'import os; print(os.path.abspath("cat.wav"))'
/home/jcomeau/cat.wav
jcomeau@intrepid:~$ ls $PWD/cat.wav
/home/jcomeau/cat.wav
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How can one pull the (private) data of one's own Android app?
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Here is what worked for me:
adb -d shell "run-as com.example.test cat /data/data/com.example.test/databases/data.db" > data.db
I'm printing the database directly into local file.
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What's the meaning of interface{}?
... stored in interfaces might be arbitrarily large, but only one word is dedicated to holding the value in the interface structure, so the assignment allocates a chunk of memory on the heap and records the pointer in the one-word slot.
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bash: shortest way to get n-th column of output
...e X in your .zshrc to be
alias -g X="| cut -d' ' -f2"
then you can do:
cat file X
You can take it one step further and define it for the nth column:
alias -g X2="| cut -d' ' -f2"
alias -g X1="| cut -d' ' -f1"
alias -g X3="| cut -d' ' -f3"
which will output the nth column of file "file". You...
Propagate all arguments in a bash shell script
...@ if you actually wish your parameters to be passed the same.
Observe:
$ cat foo.sh
#!/bin/bash
baz.sh $@
$ cat bar.sh
#!/bin/bash
baz.sh "$@"
$ cat baz.sh
#!/bin/bash
echo Received: $1
echo Received: $2
echo Received: $3
echo Received: $4
$ ./foo.sh first second
Received: first
Received: secon...