Recent questions tagged bash

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bash - How can I shortern my command line prompt's current directory?

I am using Ubuntu and I am tired of this long prompts in bash when I am working with some deep directory ... /folder1/sample$ Thanks in advance! See Question&Answers more detail:os...

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

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489 views

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bash - How do file descriptors work?

Can someone tell me why this does not work? I'm playing around with file descriptors, but feel a little lost. # ... the last two error out. Why? See Question&Answers more detail:os...

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

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591 views

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bash - Linux/Unix command to determine if process is running?

I need a platform independent (Linux/Unix|OSX) shell/bash command that will determine if a specific process is ... way/command to 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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935 views

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bash - source command not found in sh shell

I have a script that uses sh shell. I get an error in the line that uses the source command. It seems source ... I have a wrong version of sh? See Question&Answers more detail:os...

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

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531 views

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bash - How to resolve symbolic links in a shell script

Given an absolute or relative path (in a Unix-like system), I would like to determine the full path of the target ... == "/Users/greg/tmp/bar". See Question&Answers more detail:os...

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

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593 views

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bash - Variable variable assignment error -"command not found"

When I run the script I get the following errors. What am I doing wrong here please? Any help ... $count_raw" echo "avg_raw=$avg_raw" See Question&Answers more detail:os...

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

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524 views

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bash - Assigning to a positional parameter

How can I assign a value to a positional parameter in Bash? I want to assign a value to a default parameter: if ... that 4 is not a 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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466 views

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bash - How to store the output of a command in a variable at the same time as printing the output?

Say I want to echo something and capture it in a variable, at the same time I see it in my screen. echo "hello ... in Bash 4.3, if this matters. See Question&Answers more detail:os...

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

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519 views

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bash - How do I pipe a file line by line into multiple read variables?

I have a file that contains information in two columns: box1 a1 box2 a2 I'm trying to read this file line by ... box2 a1 How can I fix 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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631 views

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bash - sed multiline delete with pattern

I want to delete all multiline occurences of a pattern like {START-TAG foo bar ID: 111 foo bar END-TAG} ... multiline replace but not the same. See Question&Answers more detail:os...

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

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561 views

1 answer

bash - Using sed to insert file content

I'm trying to insert a file content before a given pattern Here is my code: sed -i "" "/pattern/ { i\ r ... the content of the file. Any ideas ? See Question&Answers more detail:os...

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

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781 views

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bash - What does "plus colon" ("+:") mean in shell script expressions?

What does this mean? if ${ac_cv_lib_lept_pixCreate+:} false; then : $as_echo_n "(cached) " >&6 else ... the name of this syntax? See Question&Answers more detail:os...

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

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495 views

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bash - How do I pass on script arguments that contain quotes/spaces?

I'm trying to write a script notify-finish that can be prepended to any command. When done, it will run ... make this work for all arguments? See Question&Answers more detail:os...

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

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579 views

1 answer

bash - How to reset COMP_WORDBREAKS without affecting other completion script?

There is something confuse me when I implement a bash auto-completion function which I'll put it in /etc/bash_completion. ... 4.2.10(1)-release See Question&Answers more detail:os...

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

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611 views

1 answer

bash - Send commands to a GNU screen

I have a GNU screen named demo, I want to send commands to it. How do I do this? screen -S demo -X /home ... -ls shows that it isn't running. See Question&Answers more detail:os...

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

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687 views

1 answer

bash - Command line to delete all ClearCase view-private files

I'm looking for a command line to remove all view-private files and directories from a ClearCase view on Windows ... having to select each one. See Question&Answers more detail:os...

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

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483 views

1 answer

bash - Building R Packages using Alternate GCC

The systems I work with have GCC 4.5 (experimental) in /usr/local/bin/gcc which has proven to be problematic for ... one in /usr/local/bin/? See Question&Answers more detail:os...

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

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895 views

1 answer

bash - How to find/replace and increment a matched number with sed/awk?

Straight to the point, I'm wondering how to use grep/find/sed/awk to match a certain string (that ends with a ... sed does with the "i" option. See Question&Answers more detail:os...

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

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529 views

1 answer

bash - Connect to sqlplus in a shell script and run SQL scripts

I have a .sql file, which is a bunch of oracle pl/sql commands and I want to create a shell script to run ... shell script to do such a task? See Question&Answers more detail:os...

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

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577 views

1 answer

bash - Linux Script to check if process is running and act on the result

I have a process that fails regularly & sometimes starts duplicate instances.. When I run: ps x |grep -v grep ... -c "processname") If possible. See Question&Answers more detail:os...

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

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637 views

1 answer

bash - Misunderstanding in how curly braces work in shell

I have a little bit of misunderstanding here. So, I execute these commands: mkdir Week {1..13} touch {1..13}.txt ... it works like that. Could anyone explain it to me if possible?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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