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Extract substring using regexp in plain bash
...
Using pure bash :
$ cat file.txt
US/Central - 10:26 PM (CST)
$ while read a b time x; do [[ $b == - ]] && echo $time; done < file.txt
another solution with bash regex :
$ [[ "US/Central - 10:26 PM (CST)" =~ -[[:space:]]*([0-9]{2}:[0-9]{2}) ...
Get list of passed arguments in Windows batch script (.bat)
..._"
echo on
for %%b in (1) do rem * #%1#
@echo off
) > param.txt
ENDLOCAL
for /F "delims=" %%L in (param.txt) do (
set "param1=%%L"
)
SETLOCAL EnableDelayedExpansion
set "param1=!param1:*#=!"
set "param1=!param1:~0,-2!"
echo %%1 is '!param1!'
The trick is to enable echo on and exp...
How to generate an openSSL key using a passphrase from the command line?
...ssions, and specify that:
openssl genrsa -aes128 -passout file:passphrase.txt 3072
Or supply the passphrase on standard input:
openssl genrsa -aes128 -passout stdin 3072
You can also used a named pipe with the file: option, or a file descriptor.
To then obtain the matching public key, you n...
What does the “@” symbol do in Powershell?
... a hash table with key-value pairs, e.g.
$HashArguments = @{ Path = "test.txt"; Destination = "test2.txt"; WhatIf = $true }
Splatting (see about_splatting)
Let's you invoke a cmdlet with parameters from an array or a hash-table rather than the more customary individually enumerated parameters, e....
How do I move a single folder from one Subversion repository to another repository?
...svn log URL_to_docs | awk '/^r/{gsub(/^r/,"",$1);print $1}' > revisions.txt
#tac for revisions in reverse (oldest revision first)
tac revisions.txt | while read line; do svnadmin dump /svn/old_repo -r$line >> ./docs_revisions.dump ; done
#You don't have to filter if you commited only files...
How do I remove a submodule?
...lar directory, you would get error message like:
git add mysubmodule/file.txt
Path 'mysubmodule/file.txt' is in submodule 'mysubmodule'
Note: since Git 2.17 (Q2 2018), git submodule deinit is no longer a shell script.
It is a call to a C function.
See commit 2e61273, commit 1342476 (14 Jan 20...
How to do a PUT request with curl?
...
An example PUT following Martin C. Martin's comment:
curl -T filename.txt http://www.example.com/dir/
With -T (same as --upload-file) curl will use PUT for HTTP.
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What are file descriptors, explained in simple terms?
...eep 14726 root rtd DIR 8,1 4096 2 /
sleep 14726 root txt REG 8,1 35000 786587 /bin/sleep
sleep 14726 root mem REG 8,1 11864720 1186503 /usr/lib/locale/locale-archive
sleep 14726 root mem REG 8,1 2030544 137184 /lib/x86_64-linux-gnu/libc-2.27.so
sle...
Iterating through directories with Python
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C:/Users/sid/Desktop/test\src\app/cool.txt C:/Users/sid/Desktop/test\src\app/woohoo.txt Ya in the open statement of my code, i think i have to give the absolute path to the file. import os rootdir ='C:/Users/spemmara/Desktop/test/src/app/' for subdir, dirs, fi...
Python: Is it bad form to raise exceptions within __init__?
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The standard library says:
>>> f = file("notexisting.txt")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory: 'notexisting.txt'
Also I don't really see any reason why it should be considered bad f...