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--- linux:bash [2022/08/10 03:13] – [Linux.Bash] admin
+++ linux:bash [2024/02/14 06:45] (current) – [Linux.Bash] admin
@@ Line 8: / Line 8: @@
 setopt histreduceblanks
+</code>
+<code BASH>
+# check xterm color
+msgcat
+</code>
+++++ Пример|
+{{:linux:linux:bash:pasted:20240214-064440.png}}
+++++
+<code BASH>
+# grep for configuration without comment line
+egrep -v "^$|^[[:space:]]*#" /etc/postfix/main.cf
 </code>
 bash
@@ Line 48: / Line 60: @@
 <code BASH>
 http -hdo ./body httpbin.org/get 2>&1
 # выделение и формирование объекта
@@ Line 54: / Line 67: @@
 jq -r '.' | grep 1
-# рекурсивно выделить в json объект в имени которого есть "Mounts"
+# JQ https://gist.github.com/pedroxs/f0ee8c515eea0dbce2e23eea7c048e10
+# рекурсивно выделить в json объект в имени которого есть "Mounts" - find key on name and get object
 jq '.. | objects | with_entries(select(.key | contains("Mounts"))) | select(. != {})'
+# same, but output propper array
+jq '[ .. | objects | with_entries(select(.key | contains("ftp"))) | select(. != {}) ]'
+# or
+jq 'map( .. | objects | with_entries(select(.key | contains("ftp"))) | select(. != {}) )'
+# transform input from {type: a, amount: 1} to {a: 1} and sum all values by type
+jq '[ .[] | {(.type): .amount} ] | map(to_entries) | add | group_by(.key) | map({key: .[0].key, value: map(.value) | add}) | from_entries'
+# invert selection of contains key name
+journalctl -f  -o json | jq -cr 'select(._SYSTEMD_UNIT=="monitorinflux.service"| not ) | {unit:._SYSTEMD_UNIT, mess:.MESSAGE}'
+</code>
+image magic
+<code BASH>
+create collage from files
+"C:\Program Files\ImageMagick-7.1.0-Q16-HDRI\magick.exe" montage *.jpg c:\tmp\montage.jpg
 </code>
@@ Line 119: / Line 147: @@
 - BBCP
+===== Scripting =====
+  * scripting pitfails https://mywiki.wooledge.org/BashPitfalls#cat_file_.7C_sed_s.2Ffoo.2Fbar.2F_.3E_file
+===== Scripting-code =====
+  * read line by line - https://phoenixnap.com/kb/bash-read-file-line-by-line
+<code BASH>
+#!/bin/bash
+# Declare variables
+vm_name=""
+vm_path=""
+skipped_lines=""
+current_line_number=1
+# Read the file line by line
+while IFS=';' read -r vm_name vm_path; do
+  # Check if the line has the correct format
+  if [[ -z "$vm_name" ]] || [[ -z "$vm_path" ]]; then
+    skipped_lines="${skipped_lines}Line ${current_line_number}: ${line}\n"
+  fi
+  # Process the variables here if the line has the correct format
+  if [[ -n "$vm_name" ]] && [[ -n "$vm_path" ]]; then
+    echo "VM name: $vm_name"
+    echo "VM path: $vm_path"
+  fi
+  # Increment the line number
+  current_line_number=$((current_line_number+1))
+done < file.txt
+# Print the skipped lines
+if [[ -n "$skipped_lines" ]]; then
+  echo "The following lines were skipped because they did not have the correct format:"
+  echo "$skipped_lines"
+fi
+</code>