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AWK: Access captured group from line pattern
...rint ary['${2:-'0'}']}'; }
Usage
Capture regex for each line in file
$ cat filename | regex '.*'
Capture 1st regex capture group for each line in file
$ cat filename | regex '(.*)' 1
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Exception handling in R [closed]
...iscontinued, but you can try
Github search as e.g. in this query for tryCatch in language=R;
Ohloh/Blackduck Code search eg this query for tryCatch in R files
the Debian code search engine on top of the whole Debian archive
Just for the record, there is also try but tryCatch may be preferable....
echo that outputs to stderr
...t, including arguments (-n) that echo would normally swallow:
echoerr() { cat <<< "$@" 1>&2; }
Glenn Jackman's solution also avoids the argument swallowing problem:
echoerr() { printf "%s\n" "$*" >&2; }
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Get Android .apk file VersionName or VersionCode WITHOUT installing apk
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how can I read apk content without installing the application? @PatrickCho
– talha06
Feb 22 '14 at 14:27
2
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How to get a specific version of a file in Mercurial?
...ace to match a prior revision. If you want it not in place you can use hg cat -r revisionid filename (substituting revisionid and filename of course) which will output the file to stdout, suitable for redirecting anyplace you'd like.
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Exact difference between CharSequence and String in java [duplicate]
...kind of sharing is all right.
The + operator of String is compiled as invocations of various StringBuilder.append calls. So it is equivalent to
System.out.println(
(new StringBuilder())
.append("output is : ")
.append((Object)obj)
.append(" ")
.append(str)
.toString()
)
I must confes...
How to get the last character of a string in a shell?
...ying to print the last characters on a big file, this did the job for me: cat user/folder/file.json | tail -c 1 You can replace the 1 with the number of characters you want to print.
– Diego Serrano
Mar 31 at 20:18
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The most sophisticated way for creating comma-separated Strings from a Collection/Array/List?
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The StringBuilder class can be seen as a mutable String object which allocates more memory when its content is altered.
The original suggestion in the question can be written even more clearly and efficiently, by taking care of the redundant trailing comma:
StringBuilder result = new StringB...
Pipe to/from the clipboard in Bash script
...send data to the clipboard that works with Ctrl + C, Ctrl + V in most applications.
If you're on Mac OS X, there's pbcopy. e.g cat example.txt | pbcopy
If you're in Linux terminal mode (no X) then look into gpm or screen which has a clipboard. Try the screen command readreg.
Under Windows 10+ or...
How to get Erlang's release version number from a shell?
.../erl
$ cd /usr/bin
$ ls -l erl
../lib/erlang/bin/erl
$ cd ../lib/erlang/
$ cat releases/17/OTP_RELEASE
17.3
EDIT
# Some versions seem to have OTP_VERSION instead of OTP_RELEASE
$ cat releases/17/OTP_VERSION
17.4
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