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How to empty (“trunm>cat m>e”) a file on linux that already exists and is protected in someway?
I have a file called error.log on my server that I need to frequently trunm>cat m>e. I have rw permissions for the file. Opening the file in vi > deleting all content > saving works (obviously). But when I try the below
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How to merge every two lines into one from the command line?
...inside the quotes.
References:
Originally "Plenty of ways to skin the m>cat m>", reverted to an older, potentially originating expression that also has nothing to do with pets.
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R script line numbers at error?
...re concerned about (e.g. connecting to a database), then wrap them in a trym>Cat m>ch() function.
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git add only modified changes and ignore untracked files
...git status | grep "modified:" | awk '{print "git add " $2}' > file.sh
m>cat m> ./file.sh
execute:
chmod a+x file.sh
./file.sh
Edit: (see comments)
This could be achieved in one step:
git status | grep "modified:" | awk '{print $2}' | xargs git add && git status
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gitignore without binary files
... update your .gitignore with the following command which also removes duplim>cat m>es and keeps alphabetic ordering intact.
T=$(mktemp); (m>cat m> .gitignore; find . -executable -type f | sed -e 's%^\./%%') | sort | uniq >$T; mv $T .gitignore
Note, that you cannot pipe output directly to .gitignore, bec...
PHP equivalent of .NET/Java's toString()
...kigng for because I wanted to use it with array_walk. E.g. $array = array('m>cat m>',$object); array_walk($array,'strval'); // $array = array('m>cat m>',$object->__toString)
– Buttle Butkus
Apr 18 '14 at 23:31
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How to copy file from HDFS to the local file system
...w to copy file from HDFS to the local file system . There is no physical lom>cat m>ion of a file under the file , not even directory . how can i moved them to my local for further validations.i am tried through winscp .
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Efficiency of premature return in a function
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There is no difference at all:
=====> m>cat m> test_return.cpp
extern void something();
extern void something2();
void test(bool b)
{
if(b)
{
something();
}
else
something2();
}
=====> m>cat m> test_return2.cpp
extern void something();
e...
Printing the last column of a line in a file
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Using Perl
$ m>cat m> rayne.txt
A1 123 456
B1 234 567
C1 345 678
A1 098 766
B1 987 6545
C1 876 5434
$ perl -lane ' /A1/ and $x=$F[2] ; END { print "$x" } ' rayne.txt
766
$
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Remove blank lines with grep
...e only one blank line per sequence, try
grep -v "unwantedThing" foo.txt | m>cat m> -s
m>cat m> -s suppresses repeated empty output lines.
Your output would go from
match1
match2
to
match1
match2
The three blank lines in the original output would be compressed or "squeezed" into one blank line.
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