Stack Exchange

Jonathan Leffler

Colorado, USA

https://stackoverflow.com/users/15168

Long-time Informix user and developer, experienced in C and Unix (many variants).

Email: jonathan.leffler@gmail.com

Some of my answers to (or thoughts about and experiments towards answers to) Stack Overflow Questions are available on GitHub in my SOQ repository.

FSF Member since April 2011

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Top Questions
Top Answers
2037
How do I use extern to share variables between source files?
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1433
How can I pipe stderr, and not stdout?
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1215
Capturing multiple line output into a Bash variable
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776
"static const" vs "#define" vs "enum"
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629
How to allocate aligned memory only using the standard library?
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606
What's a concise way to check that environment variables are set in a Unix shell script?
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596
How can I exclude all "permission denied" messages from "find"?
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588
What are the differences between Perl, Python, AWK and sed?
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467
#define macro for debug printing in C?
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457
How to represent multiple conditions in a shell if statement?
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387
How to convert DOS/Windows newline (CRLF) to Unix newline (LF)
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384
Command to get nth line of STDOUT
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332
Understanding typedefs for function pointers in C
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311
What do @, - and + do as prefixes to recipe lines in Make?
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297
warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
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291
Correct format specifier to print pointer or address?
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281
Can't compile C program on a Mac after upgrade to Mojave
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280
What is the bit size of long on 64-bit Windows?
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277
Difference between natural join and inner join
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271
Is there a way to specify how many characters of a string to print out using printf()?
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269
What does the C++ standard state the size of int, long type to be?
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269
Shell command to find lines common in two files
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262
How to iterate over arguments in a Bash script
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258
What does a type followed by _t (underscore-t) represent?
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253
How to get a shell environment variable in a makefile?
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245
How can I concatenate twice with the C preprocessor and expand a macro as in "arg ## _ ## MACRO"?
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235
How to redirect output of an entire shell script within the script itself?
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219
Add new column with foreign key constraint in one command
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213
Why is the gets function so dangerous that it should not be used?
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200
How can I debug a Bash script?
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