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How to get the command line args passed to a running process on unix/linux systems?
...re is more info in /proc/<pid> on Linux, just have a look.
On other Unixes things might be different. The ps command will work everywhere, the /proc stuff is OS specific. For example on AIX there is no cmdline in /proc.
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How do I get the path of a process in Unix / Linux
... obtain the path which is running a process. Is there something similar in Unix / Linux?
11 Answers
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Why are dates calculated from January 1st, 1970?
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It is the standard of Unix time.
Unix time, or POSIX time, is a system for describing points in time, defined as the number of seconds elapsed since midnight proleptic Coordinated Universal Time (UTC) of January 1, 1970, not counting leap seco...
How to Calculate Execution Time of a Code Snippet in C++
... of a C++ code snippet in seconds. It must be working either on Windows or Unix machines.
18 Answers
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Unix shell script to truncate a large file
I am trying to write a Unix script which will truncate/empty a file which is continuously being written/open by an application when it reaches say 3GB of space. I know that the below command would do it :
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Windows equivalent to UNIX pwd
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cd without any parameters is equivalent to pwd on Unix/Linux.
From the console output of typing cd /?:
Displays the name of or changes the current directory.
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Type CD without parameters to display the current drive and directory.
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Convert unix time to readable date in pandas dataframe
I have a dataframe with unix times and prices in it. I want to convert the index column so that it shows in human readable dates.
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Convert decimal to hexadecimal in UNIX shell script
In a UNIX shell script, what can I use to convert decimal numbers into hexadecimal? I thought od would do the trick, but it's not realizing I'm feeding it ASCII representations of numbers.
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unix diff side-to-side results?
How can I plot the results of a unix diff command side-to-side instead of one difference after the other? See below for an example:
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How do I set the time zone of MySQL?
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It will return 02:00:00 if your timezone is +2:00.
To get the current UNIX timestamp:
SELECT UNIX_TIMESTAMP();
SELECT UNIX_TIMESTAMP(NOW());
To get the timestamp column as a UNIX timestamp
SELECT UNIX_TIMESTAMP(`timestamp`) FROM `table_name`
To get a UTC datetime column as a UNIX timestam...