cat | 易学教程

cat EOF issues with indentation [duplicate]

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问题 This question already has answers here : here-document gives 'unexpected end of file' error (5 answers) Multi-line string with extra space (preserved indentation) (7 answers) Closed 8 months ago . NOTE: If anyone feel this question has been answered before please paste your answer below otherwise please don't interfere with people trying to help someone who needs help. Thanks I am not sure why it is such an hassle trying to cat content to file when the content is indented Can anyone point to

cat multiple files over one ssh connection and get return value for each

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问题 As said in the title, i'm trying to cat multiple files (content needs to be appended to existing files on host) over one ssh connection and get return value for each, i.e. if that cat for the particular file was successful or not. Up to now, i did this for each file individually, by just repeating the following command for each and checking the return value. cat specific_file | ssh user@host -i /root/.ssh/id_rsa "cat >> result/specific_file" I then just checked the return value for each

Loop to concatenate multiple pairs of files with almost the same name in UNIX

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问题 I have a very basic question, but I can't get a solution. I have multiple files in the same directory and I would like to concatenate each pair of files. The names are: Sample1_R1_L001.fastq Sample1_R2_L001.fastq Sample2_R1_L001.fastq Sample2_R2_L001.fastq Sample3_R1_L001.fastq Sample3_R2_L001.fastq (etc...) The result I want is to concatenate by sample, such as cat Sample1_R1_L001.fastq Sample1_R2_L001.fastq > Sample1_concat.fastq I tried this loop, find . -name " _R?_ "|while read file; do

find and cat to merge csv files

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问题 I have thousands of files in sub-directories of ~/data. I wish to merge all those csv files with a certain extension say .x and save the merged file to ~/data/merged.x I know I need to use find,cat and >> with the option -iname, but I'm finding it hard to do. Thanks in advance 回答1: find ~/data -name "*.x" | while read file do cat $file >> ~/data/merged.x done 回答2: find ~/data -type f ! -name 'merged.x' -a -name '*.x' -exec cat {} \+ >> ~/data/merged.x 回答3: find ./data/ -type f -name "*.c*" |

卷积核是奇数的原因

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吴恩达的DeepLearning课程讲了两个原因：一是padding的原因，如果f是奇数，就可以从图像的两边对称的padding。二是奇数的f 有明确的锚点（central pixel ）可以方便的确定position。来源： CSDN 作者： like_study_cat 链接： https://blog.csdn.net/like_study_cat/article/details/103454445

R, sink/cat: Output something else than numbers?

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问题 I'm rather new to R and I guess there's more than one thing inadequate practice in my code (like, using a for loop). I think in this example, it could be solved better with something from the apply-family, but I would have no idea how to do it in my original problem - so, if possible, please let the for-loop be a for-loop. If something else is bad, I'm happy to hear your opinion. But my real problem is this. I have: name <- c("a", "a", "a", "a", "a", "a","a", "a", "a", "b", "b", "b","b", "b",

How to know when stdin is empty if it contains EOF?

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问题 In an attempt to create a simple cat clone in python, sys.stdout.write(sys.stdin.read()) I noticed that this fails horribly for binary files (i.e. python cat.py < binaryfile > supposed_copy ) containing the CTRL + Z EOF / substitude character 0x1a, since that seems to cause read() to consider its work done. I cannot simply loop over the code forever to circumvent this, since obviously at some point stdin.read() will wait until new input is provided, which once the true end of input is reached

SpringAOP中切入点的高级使用

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上一篇 SpringAOP之使用切入点创建通知 SpringAOP中切点的高级使用一、使用控制流切入点(ControlFlowPointcut) 什么是控制流切入点呢？看下面的代码(为了方便，就写进了一个公共类) class Cat { public void talk() { System.out.println("I am a cat"); } public void play() { System.out.println("I am palying"); } } class BlackCat { public void sleep(Cat cat) { cat.play(); System.out.println("I am a blackCat , I am sleeping"); } } /** * 创建前置通知类 */ class BeforeAdvice implements MethodBeforeAdvice{ @Override public void before(Method method, Object[] objects, @Nullable Object o) throws Throwable { System.out.println("这个方法被通知了"+method); } } 需求：我们要给Cat的play()方法进行通知，但是呢

Bash: sort find results using part of a filename [duplicate]

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问题 This question already has answers here : Bash and sort files in order (7 answers) Closed 4 years ago . I have 3 webcams set up in a building, uploading still images to a webserver. I'm using ffmpeg to encode the jpgs to mp4 video. The directories are set up like this: Cam1/201504 Cam1/201505 Cam2/201504 Cam2/201505 Cam3/201504 Cam3/201505 I'm using the following bash loop/ffmpeg parameters to make one video per camera, per year. This works well so far (well... except that my SSD is rapidly

bash并行

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bash中可以通过并行执行来提高效率。 1、无限制的并行实例： ##串行脚本 [ root@centos7 scripts ] # cat serial_proc_ping.sh #!/usr/bin/bash #串行执行ping主机命令 #v1.0 by zhaoyq 20191210 for i in { 1 .. 255 } do ip = 192.168.86. $i ping -c1 -W1 $ip & > /dev/null if [ $? -eq 0 ] then echo " $ip is up!" fi done [ root@centos7 scripts ] # ##执行时间 4分9.156秒 [ root@centos7 scripts ] # time ./serial_proc_ping.sh 192.168.86.1 is up ! 192.168.86.2 is up ! 192.168.86.128 is up ! 192.168.86.129 is up ! 192.168.86.130 is up ! real 4m9.156s user 0m0.184s sys 0m0.534s [ root@centos7 scripts ] # ##并行脚本 [ root@centos7 scripts ] # cat multi_proc_ping