## page was renamed from Linux/FindGrepAwkSed
Describe Linux/FindGrepAwkSedXargs here.

== Find files containing something in Linux ==
 * https://swcarpentry.github.io/shell-novice/07-find/index.html
 * [[regex]] only part of grep match returned

== Search dir for files containing string and replace all of them ==
{{{
##e.g. search for tentant -> tenant
grep -irlZ 'tentant' ./ |  xargs -0  sed -i 's/tentant/tenant/g'
}}}

== Delete files older than 30 days ==
 * Check 1st {{[
find /opt/backup -type f -mtime +30 
}}}
 * Permanently delete ALL the files in folder older thatn 30d {{{
find /opt/backup -type f -mtime +30 -delete 
}}}
 * Permanently delte ALL files with a specific extention older than 30d {{{
find /var/log -name "*.log" -type f -mtime +30 -delete 
}}}
 * Note when deleting dir's with {{{ -type d }}} be carefull parent dir might have old modification and everything below will be lost.

== Bash loop over files ==
 * Rather than using find and xargs, use globing to find and process files in bash
   * e.g. {{{
#By enabling the globstar option, you can glob all matching files in this directory and all subdirectories:
# Make sure globstar is enabled
shopt -s globstar
for i in **/*.txt; do # Whitespace-safe and recursive
    process "$i"
done
}}}

=== awk script to duplicate section under " labels:" of k8s yaml file to " spec: { selector: { matchLables:  <...> } } ===
 * Explain
   1. looks for /Deployment/ set f=0
   1. look for /labels:/ but only if f=0, set it to 1
   1. look for /spec:/ only if f=1, increase it and run only if=2, now insert info captured in var a
   1. else save line in a[c++] if f
 * Script {{{
#!/bin/bash
# Reads k8s deployment.yaml, copy the labels: to spec: selector:
gawk -i inplace '
{ print }
/Deployment/ { f=0 }
/labels:/ { if(f == 0) f=1 }
/spec:/ { if(f == 1) {
    f=f+1
    if (f==2) {
      print "  selector:"
      print "    matchLabels:"
      for(i=2;i<=c;i++) print "  "a[i]
    }
  }
}
f{ a[++c]=$0 }
' $1

}}}
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CategoryLinux