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Bash Templating: How to build configuration files from templates with Bash?
... RHS references some variable that references itself:
#!/bin/bash
line="$(cat; echo -n a)"
end_offset=${#line}
while [[ "${line:0:$end_offset}" =~ (.*)(\$\{([a-zA-Z_][a-zA-Z_0-9]*)\})(.*) ]] ; do
PRE="${BASH_REMATCH[1]}"
POST="${BASH_REMATCH[4]}${line:$end_offset:${#line}}"
VARNAME="${B...
How to check if a value exists in an array in Ruby
I have a value 'Dog' and an array ['Cat', 'Dog', 'Bird'] .
26 Answers
26
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How can I get Docker Linux container information from within the container itself?
...tainer id can be found in /proc/self/cgroup
So you can get the id with :
cat /proc/self/cgroup | grep -o -e "docker-.*.scope" | head -n 1 | sed "s/docker-\(.*\).scope/\\1/"
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Replace string within file contents
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If you are on linux and just want to replace the word dog with catyou can do:
text.txt:
Hi, i am a dog and dog's are awesome, i love dogs! dog dog dogs!
Linux Command:
sed -i 's/dog/cat/g' test.txt
Output:
Hi, i am a cat and cat's are awesome, i love cats! cat cat cats!
Origina...
Write lines of text to a file in R
...riteLines() is roughly ten times faster then the combination of sink() and cat()
– rafa.pereira
Oct 1 '15 at 9:36
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In Bash, how do I add a string after each line in a file?
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I prefer echo. using pure bash:
cat file | while read line; do echo ${line}$string; done
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Regex: match everything but specific pattern
... answered Nov 6 '09 at 13:40
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How do I use the lines of a file as arguments of a command?
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If your shell is bash (amongst others), a shortcut for $(cat afile) is $(< afile), so you'd write:
mycommand "$(< file.txt)"
Documented in the bash man page in the 'Command Substitution' section.
Alterately, have your command read from stdin, so: mycommand < file.txt
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count (non-blank) lines-of-code in bash
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cat foo.c | sed '/^\s*$/d' | wc -l
And if you consider comments blank lines:
cat foo.pl | sed '/^\s*#/d;/^\s*$/d' | wc -l
Although, that's language dependent.
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How to create a cron job using Bash automatically without the interactive editor?
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You may be able to do it on-the-fly
crontab -l | { cat; echo "0 0 0 0 0 some entry"; } | crontab -
crontab -l lists the current crontab jobs, cat prints it, echo prints the new command and crontab - adds all the printed stuff into the crontab file. You can see the effect by...