Recent questions tagged shell

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shell - How to strip out all of the links of an HTML file in Bash or grep or batch and store them in a text file

I have a file that is HTML, and it has about 150 anchor tags. I need only the links from these tags, ... /lessons/b05/blind-contour-drawing etc. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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840 views

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shell - Replace whitespace with a comma in a text file in Linux

I need to edit a few text files (an output from sar) and convert them into CSV files. I need to change every ... the file at all; I tried gsub. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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shell - Interrupt sleep in bash with a signal trap

I'm trying to catch the SIGUSR1 signal in a bash script that is sleeping via the sleep command: #!/bin/ ... interrupt the libc sleep() function? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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704 views

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shell - How to get the last part of dirname in Bash

Suppose I have a file /from/here/to/there.txt, and want to get only the last part of its dirname to instead of /from/here/to, what should I do? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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861 views

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shell - Uploading all of files in my local directory with curl

I want to upload all the files in one directory, and I know how to upload one file using curl like this ... current directory to an FTP server? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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768 views

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shell - In bash, is there an equivalent of die "error msg"

In perl, you can exit with an error msg with die "some msg". Is there an equivalent single command in bash? Right ... echo "some msg" && exit 1 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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710 views

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shell - Batch files - number of command line arguments

Just converting some shell scripts into batch files and there is one thing I can't seem to find...and that is a ... script so that's no good. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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shell - How to solve ADB device unauthorized in Android ADB host device?

When I'm using a rooted Android device as ADB host to send adb command "adb devices" to Samsung S4, I received ... if anyone can help on this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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657 views

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shell - Checking for the correct number of arguments

How do i check for the correct number of arguments (one argument). If somebody tries to invoke the script ... exists and is a directory. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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801 views

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shell - How do I extract the created date out of a Mongo ObjectID

I'm using the Mongo shell to query my Mongo db. I want to use the timestamp contained in the ObjectID as part ... .find({},{createdDate:1}); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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778 views

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shell - Curl to return http status code along with the response

I use curl to get http headers to find http status code and also return response. I get the http headers with ... status code in in one command? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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807 views

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shell - Check if passed argument is file or directory in Bash

I'm trying to write an extremely simple script in Ubuntu which would allow me to pass it either a filename or a ... paths are valid, and exist. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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677 views

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shell - Which terminal command to get just IP address and nothing else?

I'm trying to use just the IP address (inet) as a parameter in a script I wrote. Is there an ... address, rather than looking through ifconfig? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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736 views

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shell - Way to create multiline comments in Bash?

I have recently started studying shell script and I'd like to be able to comment out a set of lines in a shell ... */` How could I do that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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877 views

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shell - Take a full page screenshot with Firefox on the command-line

I'm running Firefox on a Xvfb in a VPS. What I want to do is to take a full page screenshot of the ... my own FireFox extension for doing this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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888 views

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shell - Can't give metadata of comment to MP3 file using ffmpeg

I want to covert a AAC to MP3 and give metadata of comment to the MP3 file using ffmpeg. But -metadata comment doesn ... .3 (clang-1103.0.32.59) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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shell - Awk replace a column with its hash value

How can I replace a column with its hash value (like MD5) in awk or sed? The original file is super huge, so I need this to be really efficient. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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791 views

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shell - Command not found when comparing string

I have this script #!/bin/sh if [ $# -ne 3 ] ; then echo "param 1, param2, and A or B " exit 1; ... does not work. How can I fix this problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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716 views

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shell - How to execute a script remotely in Python using SSH?

def execute(self,command): to_exec = self.transport.open_session() to_exec.exec_command(command) print 'Command executed' ... t run. Any clue? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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686 views

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shell - Explain the deviousness of the Perl "preamble"

The Perl manual describes a totally devious construct that will work under any of csh, sh, or Perl, such as ... in detail how this works? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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shell - php shell_exec() command is not working

I am trying to run a .sh file from php. I tried doing it with shell_exec(). but its not working I refered ... both .sh n .py files please help See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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shell - How to pass argument with exclamation mark on Linux?

I have a simple Python script that receives username and password as arguments, but my password contains two ... without changing my password? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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733 views

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shell - How to fix “No newline at end of file” warning for lots of files?

I have a huge number of source files that are all lacking a newline at the end. How do I automatically ... of programming or development tool). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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732 views

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shell - BASH: Writing a Script to Recursively Travel a Directory of N Levels

I have the following directory structure for example: /test_dir/d /test_dir/d/cron /test_dir/d/cache /test_dir/d/...( ... "${1}/${file}" See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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654 views

1 answer

shell - ^word^replacement^ on all matches in Bash?

To clarify, I am looking for a way to perform a global search and replace on the previous command used. ^word ... set option that is eluding me? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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657 views

1 answer

shell - ${1:+"$@"} in /bin/sh

I've noticed that sometimes wrapper scripts will use ${1:+"$@"} for the parameters rather than just "$@". For ... an advantage over plain "$@"? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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684 views

1 answer

shell - How to add text at the end of each line in unix

I am doing certain text processing operations and finally able to get a file something like this india sudan japan france ... How do I do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

1 answer

shell - nginx: use environment variables

I have the following scenario: I have an env variable $SOME_IP defined and want to use it in a nginx ... [emerg] unknown "some_ip" variable See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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