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Remove blank lines with grep
...e only one blank line per sequence, try
grep -v "unwantedThing" foo.txt | cat -s
cat -s suppresses repeated empty output lines.
Your output would go from
match1
match2
to
match1
match2
The three blank lines in the original output would be compressed or "squeezed" into one blank line.
...
Run a string as a command within a Bash script
...cause .gitignore ignores this folder:
touch $GENERATED
COPY_BUILD_FILE=$( cat <<COPY_BUILD_FILE_HEREDOC
cp
$build_gradle
$GENERATED/build.gradle
COPY_BUILD_FILE_HEREDOC
)
$COPY_BUILD_FILE
GRADLE_COMMAND=$( cat <<GRADLE_COMMAND_HEREDOC
gradle run
--...
What is the rationale for fread/fwrite taking size and count as arguments?
...lad someone brought this up. I did a lot of work with filesystem specs and FTP and records/pages and other blocking concepts are very firmly supported, although nobody uses those parts of the specs anymore.
– Matt Joiner
Sep 19 '10 at 4:58
...
ipython reads wrong python version
...ipython. Let's look inside:
Edit 9/7/16 -- The file now looks like this:
cat /usr/local/bin/ipython
#!/usr/bin/python
# -*- coding: utf-8 -*-
import re
import sys
from IPython import start_ipython
if __name__ == '__main__':
sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
...
How can I pretty-print JSON using Go?
...
json.MarshalIndent(data, "", "????") if you want cats. sorry
– briiC
Jun 6 '19 at 10:33
62
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ping response “Request timed out.” vs “Destination Host unreachable”
... IP address >: Destination Host Unreachable," then the routing problem occurred at a remote router, whose address is indicated by the "< IP address >" field.
Request Timed Out
This message indicates that no Echo Reply messages were received within the default time of 1 second. This can be...
How do I list all tables in a schema in Oracle SQL?
...
select * from cat;
it will show all tables in your schema cat synonym of user_catalog
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How to redirect the output of the time command to a file in Linux?
...more intuitive to do further processing.
{ time sleep 1; } 2>&1 | cat > time.txt
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Converting an integer to a string in PHP
...sing
echo "I'd like {$var} waffles"; // = I'd like 5 waffles
// String concatenation
echo "I'd like ".$var." waffles"; // I'd like 5 waffles
// The two examples above have the same end value...
// ... And so do the two below
// Explicit cast
$items = (string)$var; // $items === "5";
// Functio...
How do I parse command line arguments in Bash?
...)
Usage demo-space-separated.sh -e conf -s /etc -l /usr/lib /etc/hosts
cat >/tmp/demo-space-separated.sh <<'EOF'
#!/bin/bash
POSITIONAL=()
while [[ $# -gt 0 ]]
do
key="$1"
case $key in
-e|--extension)
EXTENSION="$2"
shift # past argument
shift # past value
;;
-...