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How can I check if a command exists in a shell script? [duplicate]

...oesnt exist? – Andrew Sep 23 '11 at 20:37 12 Andrew, try if ! type "foo" > /dev/null 2>&amp...
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Rails 2.3-style plugins and deprecation warnings running task in Heroku

... 203 Are you using Heroku? Heroku will inject plugins in Rails 3.x applications .. To avoid...
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How does this milw0rm heap spraying exploit work?

... 320 The shellcode contains some x86 assembly instructions that will do the actual exploit. spray cr...
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How do I compare two DateTime objects in PHP 5.2.8?

... <?php date_default_timezone_set('Europe/London'); $d1 = new DateTime('2008-08-03 14:52:10'); $d2 = new DateTime('2008-01-03 11:11:10'); var_dump($d1 == $d2); var_dump($d1 > $d2); var_dump($d1 < $d2); ?> bool(false) bool(true) bool(false) dev:~# php -v PHP 5.2.6-1+lenny3 with Suhosin-Pa...
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Bash history without line numbers

... 207 Try this: $ history | cut -c 8- ...
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How do I invert BooleanToVisibilityConverter?

...parameter); – JCH2k Dec 1 '14 at 17:20 add a comment  |  ...
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How to close this ssh tunnel? [closed]

...und' it says. – Jacob Feb 25 '12 at 20:43 It seems like it is. Mysql worked fine as well, but then Apache started to c...
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Removing an activity from the history stack

...ected behavior with G+ login for example. See: stackoverflow.com/questions/20383878/… Took me a while to find this bug as my app kept crashing without any trace. – Acapulco Mar 16 '14 at 7:45 ...
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JavaScript blob filename without link

... answered Apr 27 '16 at 20:08 AlexandruAlexandru 10.2k1212 gold badges8989 silver badges170170 bronze badges ...
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Get list of JSON objects with Spring RestTemplate

...etForEntity method. – Diskutant Mar 20 '15 at 12:52 Yes it should work, but might not be out of the box depending on y...