How to Tell if a File Exists in Perl

Perl has a set of useful file test operators that can be used to  see whether a file exists or not. Among them is -e, which checks to see if a file exists. This information could be useful to you when you are working on a script that needs access to a specific file, and you want to be sure that the file is there before performing operations. If, for example, your script has a log or a configuration file that it depends upon, check for it first. The example script below throws a descriptive error if a file is not found using this test. #!/usr/bin/perl$filename /path/to/your/file.doc;if (-e $filename) {print File Exists!;} First, you create a string that contains the path to the file that you want to test. Then you wrap the -e (exists) statement in a conditional block so that the print statement (or whatever you put there) is only called if the file exists. You could test for the opposite—that the file does not exist—by using the unless conditional: unless (-e $filename) {print File Doesnt Exist!;} Other File Test Operators You can test for two or more things at a time using the and () or the or (||) operators. Some other Perl file test operators are: -r checks if the file is readable-w checks if the file is writeable-x checks if the file is executable-z checks if the file is empty-f checks if the file is a plain file-d checks if the file is a directory-l checks if the file is a symbolic link Using a file test can help you avoid errors or make you aware of an error that needs to be fixed.

Immigration Should Be Placed As One Of The Highest Priorities

Today in the United States, Immigration should be placed as one of the highest priorities. Many immigrants struggle on daily bases hoping that one day there will be a solution to all their problems. Currently, we may hear suggestions or some ideas of ways to solve immigration problems, but we hope to expect changes soon. Within the United States, immigration has been thought as a plague that is rapidly spreading. Even with how immigration is now currently being addressed, new ways to help improve immigration, and how the political system can create alternatives for citizens and immigrants. The way immigration is currently being addressed is by cracking down any illegal immigrants at the border. In the article of â€Å"The White House- Issues of Immigration,† says that if anyone is attempting to cross over the border without being undocumented will be sent right back (Immigration). With border protection this will be one way to help with illegal immigrants who are trying to cro ss over. The only way this will work if border control is on top of protecting the borders from people who cross over. Another way is by deporting people who are a threat to the safety of others and who can be bring danger to families in the U.S. It mentions that he [President Obama] â€Å"has directed immigration enforcement to place anyone suspected of terrorism, violent criminals, gang members† and anyone who has crossed over the borders and is placed at â€Å"top of deportation priority list† (Immigration).Show MoreRelatedThe United States Federal Government942 Words   |  4 Pagesfederal government should limit the influx of refugees into the United States. Currently, three different entities oversee the United States Refugee Admissions Program. 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In an effort to escape religious persecution, war, or just to haveRead MoreCentral America S Child Migrants : A Humanitarian Crisis2820 Words   |  12 PagesHonduras (50,303 in total) (USCBP, 2014). The policy response to the recent surge of UAC’s has been inadequate, and highly politicized; furthermore, many of the factors driving migration are results of past policy failures of the U.S. in regard to immigration and foreign policy. There are already existing policies, asylum and the like, that if funded and implemented appropriately, would alleviate serious needs of thousands of children currently fleeing to the U.S. The systematic evaluat ion that followsRead MoreDonald Trump s Immigration Reform Essay2180 Words   |  9 PagesTrump has emphasized his belief that the needs of America need to be placed before the needs of other countries. This is supported by the statement that â€Å"[America] is the only country in the world whose immigration system puts the needs of other nations ahead of [its] own. That must change† (Immigration reform [Trump], 2016). Even though he plans to implement policies that promote American opportunity in regard to changes in immigration laws, Donald Trump is at a disadvantage when it comes to policyRead MoreImmigration : Projected Policy And Personal Stance Essay2411 Words   |  10 PagesImmigration: Projected Policy and Personal Stance Introduction Policies are pivotal implementations put in place by the government on local, state, and federal levels. There are endless amounts of policies enacted by the American government, with many of these policies directly influencing the lives of citizens. 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It is not a huge concern the population should have towards illegal immigrants; as we can find those with well morals following the idea of becoming a hard worker and helping their families; as also helping the government with quotas and those with crucial intentions that may harm the government. My theory is that these innocent immigrants should have the opportunity in the United States to follow up and gain some benefits that will help themRead MoreHDI Rating : The Intrinsic Value Of A Country1360 Words   |  6 Pages HDI rating, a system of ranking in which countries are placed into four sub categories ranging from well developed to underdeveloped. Despite taking considerations of a diverse field study of individual countries and a case by case analysis as no two counties are identical, determining the intrinsic value of a country is a dynamic process, let alone a global comparison. 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Concert Essay free essay sample

This essay examines my aesthetic cultural background and main influences throughout my life. I was born in Istanbul which is the capital city of Turkey; however, my father and mother were born in Kenya. Turkey has played a major role in the history of the world. In regard to the fact that Turkey Is an Islam country, Turkeys importance in the world is really high. The main underlying reason for that is because Turkey is the only country which is not only secular and democratic, but also Salamis as well. Based on the census data collected in 2000, Turkey has a 96. Muslim population. The influence of Islam on the Turkish people is an undeniable fact. The Turkish people have faced with Islam during the war between China and Arabs in 751. In 920, the first Turkish government accepted to be Muslim was the Caravans. With the acceptance of Islam, believes of the Turkish people have changed drastically. The Concerto No. 3 in F major uses identical groups of wind instruments, each comprised of a bassoon, a pair of oboes and horn.The groups go back and forth trading calls and echoing each others phrases. Overall I thought that this was a good piece to listen to. The overture was slow and rich and led into a fast, happy, upbeat movement that involved lots of strings. It was a beautiful piece both for listening and playing. The conductor was very lively and you could tell that he was very passionate about this polyphonic textured piece. I loved how within the movements the instruments were very dramatic, loud and repetitive. Mendelssohn Piano Concerto No. 1 in G minor was the next piece to be played by the orchestra.Overall, It was my favorite piece because the pianist was absolutely amazing, even though the concerto starts off with strings. Felix Mendelssohn was born on February 3, 1809 in Hamburg. His first performance of this piece took place on October 17, 1831 while he played the keyboard and conducted at the same time. This fact I found completely amazing and extremely Intriguing. At an early age Mendelssohn had proven his capability In the field of orchestra by producing his first large scale works including A Midsummer Nights Dream overture during his adolescence.Focusing on the music of this piece however, Piano Concerto No. 1 in G minor reveals many traits of the Romantic era style. There are three movements to this ice however they are bridged to form an uninterrupted duration of music. This piece was very dramatic with fanfares that began and concluded movements. The melodies are cheerful and the vivid G minor tonality gives the third movement a lighter character, that ends with an exhilarating closing passage. While on the topic of Mendelssohn, I am going to discuss his second piece that was played as well.Symphony No. 5 in D major wasnt my favorite piece at all. As a 1 OFF Mendelssohn first performed this Symphony in Berlin on November 15, 1832. This piece bears the title of Reformation in anticipation of the 30th anniversary of the Sagebrush Confession, which was one of the key events in the Protestant revolt led by Martin Luther against the Catholic Church. Which overall this is somewhat amusing because Mendelssohn was brought up in a Jewish home, and wrote his music according to the beliefs of Luther and the Protestants. Symphony No. In D major poppa, Reformation in reference to the early Protestant movement. One can hear this in the first movement. Though the movement gets off to a slow start, dramatic horns come in and loudly interrupt the soft, calm manner of the strings. This piece is deeply impassioned with the struggle f Martin Luther. The triumphant ending concludes the symphony. This piece being the most dramatic of all of the pieces played at Powell Hall. Finally, we come to Franz Joseph Haydn. Haydn was born on March 31, 1732 in Austria. The first performance of his Symphony No. 9 in A major Fire is unknown, but it is certain that Haydn directed the first performance no later than 1769, with the orchestra in residence at the estate of his employer. Heydays symphonies are over one hundred in number and come from the Classical era. It is unknown why this particular symphony got the name Fire for in y opinion it does not sound like what I imagine a fire sounding like. In the opening movement the music is bursting of rhythmic energy, with many loud and soft dynamics and courageous melodic leaps which gives the movement an impression of momentum.The second movement is slow and intriguing. Melodies contrast and follow each other in a different, yet interesting way. The final movements theme is a variation of the main melody, with a dramatic finale. Overall, I will have to say that I really enjoyed going to the SST. Louis Symphony Orchestra. I think that the performance was very nice, even though I wouldnt have hoses to play those pieces (they made me want to fall asleep). The conductor did a ere good Job, was lively and entertaining to watch to say the least.Now, if one was to ask if I would go again to see that same show, my answer would probably be no. I Nullity spend my money to go see something that makes me want to fall asleep :however there were performances like Disney, or anything Bach or Beethoven that Nullity be all that horrible to see). The music was enjoyable and I really liked the experience Except for the old bald guy who kept turning around and giving me dirty looks for taking notes to write this report.