in the shell script, I have the following variables to hold the url information: how do I get product_patch_20190218162130_sign.pkg? Search the awk tutorials on the Internet, learn awk fundamentals and write the following sentence: echo $urlfile |...
for example grep 20180906834424 test.log | awk {print $2} the above code will produce a result. How can I use this result as a parameter of grep to re-search the test.log file? grep 20180906834424 test.log | awk {print $2} | xargs grep PATT...
how to insert a line of code in a specified code block with commands such as sed , awk , and so on. suppose you have a file hello.php , with the following contents: piplin package, modify the app Providers AppServiceProvider.php file, and add...
recently, I was looking at an open source project and found that when I found the file upload function, I would first set up a temporary folder in the tomcat server. The whole process is divided into three steps: 1. Upload the front-end files first st...
if the picture is a template, sometimes you want to judge and then show or not show some elements name can be operated in the template engine? or can we only use js to hide and show after rendering, or define an empty variable to concatenate and then d...
topic description when volatile decorates objects and arrays, it only ensures the visibility of their reference addresses, but why does the following code print "over " immediately after I add volatile? if you don t add volatile to the array, it wil...
how to realize the convex shape in the middle with css3 ...
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