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How to check if a variable is not null?
...swered Oct 12 '14 at 22:56
Flat CatFlat Cat
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How to simulate the environment cron executes a script with?
...porarily):
* * * * * env > ~/cronenv
After it runs, do this:
env - `cat ~/cronenv` /bin/sh
This assumes that your cron runs /bin/sh, which is the default regardless of the user's default shell.
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Plus it won't change cursor location.
– nperson325681
Dec 3 '10 at 10:56
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git rebase without changing commit timestamps
... " -f1); test -n "$__date" && export GIT_COMMITTER_DATE=$__date || cat'
If something goes wrong, just checkout git reflog or all the refs/original/ refs.
Furthormore, you can do the similar thing to the author's timestamp.
For example, if the author's timestamp of some commits are out of...
Eclipse count lines of code
...iles, which includes empty lines and comments
find . -name "*.java" -exec cat | wc -l
Get information per File, this will give you [ path to file + "," + number of lines ]
find . -name "*.java" -exec wc -l {} \;
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Difference Between Select and SelectMany
...mple you can try
List<string> animals = new List<string>() { "cat", "dog", "donkey" };
List<int> number = new List<int>() { 10, 20 };
var mix = number.SelectMany(num => animals, (n, a) => new { n, a });
the mix will have following elements in flat structure like
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How to determine if a process runs inside lxc/Docker?
... output of /proc/1/sched on a container
will return:
root@33044d65037c:~# cat /proc/1/sched | head -n 1
bash (5276, #threads: 1)
While on a non-container host:
$ cat /proc/1/sched | head -n 1
init (1, #threads: 1)
This helps to differentiate if you are in a container or not.
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Is there a way to 'uniq' by column?
...first of an equal run." So, it is indeed "the first occurrence of the duplicate before sorting."
– Geremia
Apr 15 '16 at 17:32
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While loop to test if a file exists in bash
...ve my solution for anyone who experiences the same.
I found that if I ran cat /tmp/list.txt the file would be empty, even though I was certain that there were contents being placed immediately in the file. Turns out if I put a sleep 1; just before the cat /tmp/list.txt it worked as expected. There ...
Using multiple delimiters in awk
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awk -F'[/=]' '{print $3 "\t" $5 "\t" $8}' file
Produces:
tc0001 tomcat7.1 demo.example.com
tc0001 tomcat7.2 quest.example.com
tc0001 tomcat7.5 www.example.com
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