Recent questions tagged Bash

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bash - Terminal command equivalent of PHP implode when combining lines

I have a couple of lines and want to group the line into 5 and then implode it for MySQL IN () query. I have made ... WHERE id IN (8,9,10,11,12) 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 - Redirect output of command with heredoc

I have a command like this: sftp user@host <<EOF put file.txt exit EOF Now I'd like to pipe the output of ... .txt exit EOF | zenity --progress 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 - Arithmetic expansion in array indices - is the dollar sign needed?

When I use arithmetic expansion in an array index in bash, like this: declare -a FILES declare -i INDEX=0 for ... a specific answer to that yet. See Question&Answers more detail:os...

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

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938 views

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bash - Why piping to the same file doesn't work on some platforms?

In cygwin, the following code works fine $ cat junk bat bat bat $ cat junk | sort -k1,1 |tr 'b' 'z' > ... the file that I am not aware of. 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 - Do keys ${!a[@]} and values ${a[@]} of associative arrays expand in the same order?

In bash, associative arrays (also known as dictionaries or hash maps) are unordered. For the associative array a ... upcoming versions of bash? 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 - Parsing Json data columnwise in shell

When I run a command I get a response like this { "status": "available", "managed": true, "name":vdisk7 ... not to use any external library. See Question&Answers more detail:os...

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

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997 views

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bash - Why isn't the case statement case-sensitive when nocasematch is off?

Given the following: $ echo $BASH_VERSION 4.2.10(1)-release $ shopt | fgrep case nocaseglob off nocasematch off $ ... doesn't this match fail? 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 - Why does AWK refuse to sum up floats

I'm facing a rather strange problem withawk where I want to calculate the average of a column. This is the test ... how), to make awk 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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bash - Unable to separate semi-colon separated line awk

I am trying to do the following: Read a file line by line. Each line has the following structure: field1; ... uses awk within a bash script. See Question&Answers more detail:os...

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

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945 views

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bash - If statements and one line python scripts from command line

Why do I receive a syntax error for the following one liner python code? python -c 'import re; if True: ... single line from the command line? 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 - How to remove files using find and rm command?

find -mmin -19 -exec rm '{}'; It will find the modified files 1st and then remove them. but it gives me error as ... -mmin -19 -exec rm '{}'/; 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 - Wait for Network Interface Before Executing Command

I have a couple ideas on how I would achieve this. Not sure how I would script it. Method 1: (probably the ... you in advance for ANY input. 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 - Script to find duplicates in a csv file

I have a 40 MB csv file with 50,000 records. Its a giant product listing. Each row has close to 20 ... file in Python over on Stack Overflow See Question&Answers more detail:os...

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

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956 views

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bash - Printing a string value results not found

When I run my script, there is no output to the terminal. This my code: for ((h = 1 ; h < 4 ; h+ ... DPT=56506 WINDOW=46535 RES=0x00 ACK URGP=0 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 - Setting shell's control break statement in the standard input stream "EOD" to exit the COBOL program

I would like to invoke a cobol program thru shell script by assigning command line prompt values in the "EOD" ... program is Micro Focus COBOL. 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 - Current state of BeanShell

We are investigating possibility of using BeanShell to write scripts that do a lot of file operations. ... scripts is greatly appreciated. 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 - How can I redirect stderr to a file?

What is the command required to redirect the standard error descriptor to a file called error.txt in unix? I ... "report*" ________ error.txt See Question&Answers more detail:os...

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

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995 views

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bash - How can I cd into a directory using a script?

For example, let's say I have a directory called tmp and I am on the home directory $pwd /my/home/directory ... of execution of the script)? See Question&Answers more detail:os...

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

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925 views

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bash - Check number of running scripts using ps

I'm writing a script (show_volume.sh) which may be called several times in short intervals. I need a way ... script determine these odd values? 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 - How do I echo $command without breaking the layout

I'm trying to do the following in a bash script: com=`ssh host "ls -lh"` echo $com It works, ... preserve the layout when echoing a variable? See Question&Answers more detail:os...

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

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1.5k views

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bash - Is there a way to read all key-value pairs in the JSON file and then initialize all variables accordingly in shell?

Given a JSON file, arguments.json: {"dagger": true, "version": false, "nether_strike": true, " ... all variables accordingly in 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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877 views

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bash - UNIX: How to run a program with a file as an input

I'm writing a bash script called 'run' that tests programs with pre-defined inputs. It takes in a file as the ... .txt, asdf2.txt, asdf3.txt. 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 - How do I use exec 3>myfifo in a script, and not have echo foo>&3 close the pipe?

Why can't I use exec 3>myfifo in the same manner in a bash script as I can in my terminal? I'm using ... correct pipes. What am I missing 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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bash - why quote removal isn't performed between [[ ... ]]?

$ man bash Word splitting and filename expansion are not performed on the words between the [[' and ]]'; ... command 2 and 3 are different? 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

1 answer

bash - Preventing a child process (HandbrakeCLI) from causing the parent script to exit

I have a batch conversion script to turn .mkvs of various dimensions into ipod/iphone sized .mp4s, cropping/scaling ... the find | while). See Question&Answers more detail:os...

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

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974 views

1 answer

bash - Spawn subshell for SSH and continue with program flow

I'm trying to write a shell script that automates certain startup tasks based on my location (home/campusA/ ... connection to still be active. 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

1 answer

bash - grep -vf too slow with large files

I am trying filter data from data.txt using patterns stored in a file filter.txt. Like below, grep -v -f ... fails when filter.txt is empty. 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 - Specify which shell to use in R

I have to run a shell script inside R. I've considered using R's system function. However, my script involves ... use /bin/bash instead? 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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