Recent questions tagged Bash

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I have a HTML with lots of data and part I am interested in: <tr valign=top> <td><b>Total</b></td> < ... '<td align=right> 0' Any suggestions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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828 views

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bash - List all leaf subdirectories in linux

Is there an easy way to list only directories under a given directory in Linux? To explain better, I can do: ... that does not use bash loops. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bash - Shell script not running, command not found

I am very, very new to UNIX programming (running on MacOSX Mountain Lion via Terminal). I've been learning ... be greatly appreciated! Thanks!! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bash - Read Command : Display the prompt in color (or enable interpretation of backslash escapes)

I often use something like read -e -p "> All good ? (y/n)" -n 1 confirm; to ask a confirm to the user. ... man page :( -r option doesn't work) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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775 views

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bash -x command

I saw a client doing $bash -x command to see if the file is executable (or ksh -x command, etc.) ... comments are greatly appreciated. Cheers! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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731 views

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bash - Unable to change the default editor in the terminal

My default editor is Pico at my server. I use Bash and Linux. I tried to change Vim to be my default ... file .bashrc: export EDITOR='vim' See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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bash - /bin/sh^M: bad interpreter: No such file or directory

When I enter brew doctor (or any brew command) in my terminal, I get this as a response: -bash: /usr/local/bin/ ... Is there a way to fix this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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978 views

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bash - HTTP Google Sheets API v4 how to access without OAuth 2.0?

my idea is to create a google sheet, make it public and then access it from my work computer linux/bash to ... explain this method step by step? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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910 views

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bash - How do you pipe input through grep to another utility?

I am using 'tail -f' to follow a log file as it's updated; next I pipe the output of that to grep to ... for input (in case you were wondering). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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774 views

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bash - Whether to escape ( and ) in regex using GNU sed

I've noticed several posts on this site which say that with gnu sed you should use ( and ) in regex rather than ( ... ) must be used. What's up? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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883 views

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bash - Use find, wc, and sed to count lines

I was trying to use sed to count all the lines based on a particular extension. find -name '*.m' -exec ... particular line to get the totals. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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621 views

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bash - Show commands without executing them

I often interactively loop over e.g. my files and want to perform a specific operation on all of them, let's ... it might be too late already. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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863 views

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bash - Removing leading zeros before passing a shell variable to another command

It turns out that iptables doesn't handle leading zeros too well. As $machinenumber that is used has to ... ERROR - Unknown string operation See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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bash - Extract vmlinux from vmlinuz or bzImage

I want to generate System.map from vmlinuz,cause most of machines don't have the file System.map.In fact, ... records in 32768+0 records out See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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829 views

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bash - Why does Cygwin execute shell commands very slowly?

Just tests a very simple command like: while true; do bash -c "echo hello"; done You will find how much ... problem user 0m0.091s sys 0m0.476s See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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822 views

1 answer

bash - Scripting an HTTP header request with netcat

I'm trying to play around with netcat to learn more about how HTTP works. I'd like to script some of it ... not sure what causes this behavior. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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602 views

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bash - Why $'' or $'x0' is an empty string? Should be the null-character, isn't it?

bash allows $'string' expansion. My man bash says: Words of the form $'string' are treated specially. The word ... behave as echo -e 'foobar'? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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764 views

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bash script, create array of all files in a directory

I have a directory myDir of many .html files. I am trying to create an array of all the files in ... appreciate any help regarding this matter. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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bash - Cron job does NOT get the environment variables set in .bashrc

Here is my cron job: plee@dragon:~$ crontab -l * * * * * /bin/bash -l -c 'source ~/.bashrc; echo ... source .bashrc; echo $EDITOR # Output: vim See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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915 views

1 answer

bash - Today's date, minus X days in shell script

I need to create three variables, each for Year, Month, and Day for Today's date, minus X number of ... working days instead 222 regular days. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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837 views

1 answer

bash - Binary Data Posting with curl

So basically, I'm trying to write a series of scripts to interact with Dot Net Nuke. I've been analysing the ... "Kept-Secret" "Kept-Secret" See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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693 views

1 answer

bash - How do I check whether a variable has an even numeric value?

How should I change this to check whether val has an even or odd numeric value? val=2 if $((RANDOM % $val)); ... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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697 views

1 answer

bash - How can I delete every Xth line in a text file?

Consider a text file with scientific data, e.g.: 5.787037037037037063e-02 2.048402977658663748e-01 1. ... am using Ubuntu/Linux. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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736 views

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bash - Get pid of current subshell

I am trying to get the pid of a currently executing subshell - but $$ is only returning the parent pid: #!/usr ... do $! from the parent shell. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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619 views

1 answer

bash - How to send list of file in a folder to a txt file in Linux

I'm fairly new to Linux (CentOS in this case). I have a folder with about 2000 files in it. I'd like ... simply do it from the command prompt. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

1 answer

bash - source all files in a directory from .bash_profile

I need to allow several applications to append to a system variable ($PYTHONPATH in this case). I'm thinking of ... it doesn't appear to work. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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811 views

1 answer

bash - Preserve ls colouring after grep'ing

If I do $ ls -l --color=always I get a list of files inside the directory with some nice colouring for ... a stock install with no fancy configs See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

1 answer

bash - Sed gives: sed: can't read : No such file or directory

I have the following bash script which repeats for each image found. It needs to iterated over all html, css and ... what could be wrong here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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