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Commands tagged string (2)

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stringContains: Determining if a String Contains a Substring

Show Sample Output
This is sample output - yours may be different.
```
function stringContains() { [ -z "${2##*$1*}" ] && [ -z "$1" -o -n "$2" ]; };

# Used like so
SRC_STRING="this is a sample string where TEST we want to check for the word 'TEST'"
if stringContains "TEST" "$SRC_STRING"; then
	echo "Found TEST in SRC_STRING"
else
	echo "Couldn't find TEST in SRC_STRING"
fi
```
2

function stringContains() { [ -z "${2##*$1*}" ] && [ -z "$1" -o -n "$2" ]; };

mikhail · 2019-04-12 20:51:27 0
Recursive search and replace (with bash only)

Replaces a string matching a pattern in one or several files found recursively in a particular folder.
This is sample output - yours may be different.
1

find ./ -type f -name "somefile.txt" -exec sed -i -e 's/foo/bar/g' {} \;

guillaume1306 · 2019-03-06 10:13:23 0

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run command on a group of nodes in parallel redirecting outputs

Do the same as pssh, just in shell syntax. Put your hosts in hostlist, one per line. Command outputs are gathered in output and error directories.

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Show sorted list of files with sizes more than 1MB in the current dir

no fancy grep stuff here.

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Cryptographically secure 32-bit RNG in strict ZSH

ZSH ships a couple random number generators via the $RANDOM environment variable and rand48() via zsh/mathfunc, but neither are cryptographically secure. This code produces a 32-bit random number suitable for cryptography. It's only dependency is /dev/urandom and it does not rely on any shell commands or 3rd party utilities. It assumes ZSH was compiled with 64-bit integer support.

Show local/public IP adresses with or without interface argument using a shell function for Linux and MacOsX

Like the tiltle said, you can use an argument too ( the interface ) $ MyIps eth0 will show only the IP of this interface and the public IP ( tested with Linux ) You can add that function in ~/.bashrc, then $ . ~/.bashrc Now you are ready to call this function in all your terms...

git remove files which have been deleted

It deletes all removed files, updates what was modified, and adds new files.

Working random fact generator

Though without infinite time and knowledge of how the site will be designed in the future this may stop working, it still will serve as a simple straight forward starting point. This uses the observation that the only item marked as strong on the page is the single logical line that includes the italicized fact. If future revisions of the page show failure, or intermittent failure, one may simply alter the above to read. $ wget randomfunfacts.com -O - 2>/dev/null | tee lastfact | grep \ | sed "s;^.*$.*$.*$;\1;" The file lastfact, can then be examined whenever the command fails.

Convert YAML to JSON

Converts YAML file to JSON. Note that you'll need to install PyYAML. Also some YAML data types (like dates) are not supported by JSON).

Easily decode unix-time (funtion)

More recent versions of the date command finally have the ability to decode the unix epoch time into a human readable date. This function makes it simple to utilize this feature quickly.

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