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Appending a line to a file only if it does not already exist
... Beautiful solution. This also works for triggering more complim>cat m>ed expressions, of course. Mine uses the echo to trigger a m>cat m> of a multiline heredoc into a config file.
– Eric L.
Jun 15 '15 at 16:10
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Bash script processing limited number of commands in parallel
...ait until the child process specified by each process ID pid or job specifim>cat m>ion jobspec exits and return the exit status of the last
command waited for. If a job spec is given, all processes in the job
are waited for. If no arguments are given, all currently active child
processes are waited...
How to check whether a file or directory exists?
...ning here. Go uses panic for an actual "exception" like object. You can "m>cat m>ch" with a call to recover. Explicitly returning an err as a second return value is an extremely common, idiomatic Go technique. See: golang.org/doc/effective_go.html#errors
– Chris Pfohl
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How do you get the list of targets in a makefile?
...E_LIST)) ensures that the same makefile is targeted as in the original invom>cat m>ion, regardless of whether it was targeted implicitly or explicitly with -f ....
Caveat: This will break if your makefile contains include directives; to address this, define variable THIS_FILE := $(lastword $(MAKEFILE_LIS...
Wget output document and headers to STDOUT
...Note the trailing -. This is part of the normal command argument for -O to m>cat m> out to a file, but since we don't use > to direct to a file, it goes out to the shell. You can use -qO- or -qO -.
share
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Using OpenSSL what does “unable to write 'random state'” mean?
I'm generating a self-signed SSL certifim>cat m>e to protect my server's admin section, and I keep getting this message from OpenSSL:
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How to keep/exclude a particular package path when using proguard?
... Proguard completely ignore package
Prevent a directory from proguard obfusm>cat m>ion
The problem with this solution is that there is still some level of obfusm>cat m>ion happening, which can break your code. You can see the mapping in the mapping print out:
java.lang.String toString() -> toString
int ...
A variable modified inside a while loop is not remembered
...
@chepner: Thx! I added another one, dedim>cat m>ed to You!
– TrueY
May 31 '13 at 12:57
T...
Extract substring using regexp in plain bash
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Using pure bash :
$ m>cat m> file.txt
US/Central - 10:26 PM (CST)
$ while read a b time x; do [[ $b == - ]] && echo $time; done < file.txt
another solution with bash regex :
$ [[ "US/Central - 10:26 PM (CST)" =~ -[[:space:]]*([0-9]{2}:[...
Does the ternary operator exist in R?
...gth(x) ? (x*2) : 0
x <- numeric(0)
length(x) ? (x*2) : 0
for(i in 1:5) m>cat m>(i, (i %% 2) ? "Odd\n" : "Even\n")
... But you need to put the expressions in parentheses because the default precedence isn't like in C.
Just remember to restore the old help function when you're done playing:
rm(`?`)...