Recent questions tagged Unix

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unix - Can I call a function of a shell script from another shell script?

I have 2 shell scripts. The second shell script contains following functions second.sh func1 func2 The first.sh will ... How can I achieve it? See Question&Answers more detail:os...

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

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541 views

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unix - How to use find command to find all files with extensions from list?

I need to find all image files from directory (gif, png, jpg, jpeg). find /path/to/ -name "*.jpg" > log ... string to find not only .jpg files? See Question&Answers more detail:os...

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

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588 views

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unix - How to remove EXIF data without recompressing the JPEG?

I want to remove the EXIF information (including thumbnail, metadata, camera info... everything!) from JPEG files, ... , but related to .NET. See Question&Answers more detail:os...

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

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719 views

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unix - Syntax highlighting/colorizing cat

Is there a method to colorize the output of cat, the way grep does. For grep, in most consoles it ... has never seen colors since epoch. See Question&Answers more detail:os...

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

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663 views

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unix - How to pipe list of files returned by find command to cat to view all the files

I am doing a find and then getting a list of files. How do I pipe it to another utility like cat (so ... to grep something from these files. See Question&Answers more detail:os...

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

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906 views

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unix - What's the difference between ${varname} and $varname in a shell scripts

I have a simple question but I wonder what is the difference between ${varname} and $varname ? I use both but I ... to use one or the other. See Question&Answers more detail:os...

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

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748 views

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unix - How do I change a shell scripts character encoding?

I am using Gina Trapiani's excellent todo.sh to organize my todo-list. However being a dane, it would be nice if the ... me how to 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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417 views

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unix - C++: how to get fprintf results as a std::string w/o sprintf

I am working with an open-source UNIX tool that is implemented in C++, and I need to change some code to ... , what have I overlooked? Thanks. See Question&Answers more detail:os...

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

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unix - How to prevent BrokenPipeError when doing a flush in Python?

Question: Is there a way to use flush=True for the print() function without getting the BrokenPipeError? I ... BrokenPipeError: sys.exit() See Question&Answers more detail:os...

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

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559 views

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unix - What's the difference between "C system calls" and "C library routines"?

There are multiple sections in the manpages. Two of them are: 2 Unix and C system calls 3 C Library routines ... and what is the difference? See Question&Answers more detail:os...

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

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622 views

1 answer

unix - Docker CE on RHEL - Requires: container-selinux >= 2.9

I am trying to install Docker CE on RHEL using this link. This is my RHEL version: Red Hat Enterprise Linux Server ... Docker CE in RHEL 7.3. 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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unix - Display filename before matching line

How can I get grep to display the filename before the matching lines in its output? See Question&Answers more detail:os...

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

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585 views

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unix - Diff files present in two different directories

I have two directories with the same list of files. I need to compare all the files present in both the ... and then iterate through them? See Question&Answers more detail:os...

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

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554 views

1 answer

unix - Why does RSA encrypted text give me different results for the same text

I am encrypting data with openSSL using RSA encryption, which works fine. My understanding of RSA is, that ... by itself is not unique. See Question&Answers more detail:os...

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

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601 views

1 answer

unix - Calculating elapsed time in a C program in milliseconds

I want to calculate the time in milliseconds taken by the execution of some part of my program. I've been looking ... you know how 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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624 views

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unix - How to grep for the whole word

I am using the following command to grep stuff in subdirs find . | xargs grep -s 's:text' However, this also ... should be on same line.... See Question&Answers more detail:os...

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

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740 views

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unix - Get last field using awk substr

I am trying to use awk to get the name of a file given the absolute path to the file. For example, when ... this with the awk substr 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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616 views

1 answer

unix - Bash script to receive and repass quoted parameters

I'm trying to get quoted parameters of a bash script to safely be received by a nested script. Any ideas? test.sh ... "ccc ddd" aaa bbb ccc ddd See Question&Answers more detail:os...

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

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662 views

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unix - How do I escape spaces in path for scp copy in Linux?

I'm new to linux, I want to copy a file from remote to local system... now I'm using scp command ... name or directory names during copying... 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

1 answer

unix - Variables as commands in bash scripts

I am writing a very simple bash script that tars a given directory, encrypts the output of that, and then ... how Bash is escaping things. See Question&Answers more detail:os...

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

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549 views

1 answer

unix - What should we do to prepare for 2038?

I would like to think that some of the software I'm writing today will be used in 30 years. But I am ... But what about the year 292278994? See Question&Answers more detail:os...

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

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544 views

1 answer

unix - Extract specific columns from delimited file using Awk

Sorry if this is too basic. I have a csv file where the columns have a header row (v1, v2, etc.) ... names rather than with column numbers? See Question&Answers more detail:os...

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

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396 views

1 answer

unix - How do I manipulate $PATH elements in shell scripts?

Is there a idiomatic way of removing elements from PATH-like shell variables? That is I want to take PATH=/home ... the $PATH variable in Bash? See Question&Answers more detail:os...

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

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603 views

1 answer

unix - How to split a delimited string into an array in awk?

How to split the string when it contains pipe symbols | in it. I want to split them to be in array. I tried ... do I split them into an array? See Question&Answers more detail:os...

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

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555 views

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unix - properly join two files based on 2 columns in common

I have two files I'm trying to join/merge based on columns 1 and 2. They look something like this, ... 33256 0.769230769230769 0.90625 45339 See Question&Answers more detail:os...

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

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