250123 ‐ linux - cywongg/2025 GitHub Wiki

To achieve your desired goal, you can use a combination of Linux commands like grep, awk, sed, and sort to parse, extract, and format the data. Here's how you can do it step by step:

Step 1: Extract Unique Lines

Extract unique log lines containing the text failed to create connector to and format them into hostname/ip:port.

grep "failed to create connector to" log_file | awk '{print $6}' | sort -u > connectors.csv

Explanation:

grep extracts all lines containing failed to create connector to.
awk '{print $6}' extracts the 6th field (e.g., SRVTPEGdshjUT101.hostnme.com/176.18.240.161:14212).
sort -u removes duplicates and sorts the output.
The output is written to connectors.csv.

Step 2: Reformat as CSV

Transform the extracted lines into {host}/{ip}:{port} format.

awk -F'[/|:]' '{print $1 "/" $2 ":" $3}' connectors.csv > formatted_connectors.csv

Explanation:

-F'[/|:]' sets /, |, and : as field delimiters.
{print $1 "/" $2 ":" $3} reformats the fields into the desired {host}/{ip}:{port} format.
The result is saved in formatted_connectors.csv.

Step 3: Extract Subscription Sources

Search for lines containing Subscription source= and extract the corresponding Subscription source, host, and port.

grep "Subscription source=" log_file | awk -F'[=|]' -v CONN_FILE=formatted_connectors.csv '
BEGIN {
    while (getline < CONN_FILE) {
        hosts[$1] = 1;
    }
}
{
    for (host in hosts) {
        if ($0 ~ host) {
            print $2 "," host;
        }
    }
}' > subscription_sources.csv

Explanation:

grep "Subscription source=" extracts relevant lines with Subscription source=.
awk -F'[=|]' splits fields by = or |.
BEGIN { while (getline < CONN_FILE) { hosts[$1] = 1; } } loads hosts from formatted_connectors.csv.
if ($0 ~ host) checks if the log line contains any of the extracted hosts.
print $2 "," host extracts the subscription source (field 2) and the matching host.

Step 4: Validate and Review

Check the subscription_sources.csv file for the final output, which should look like this:

HKasd3L,SRVTPEGdshjUT101.hostnme.com

Optional: Combine All Steps into a Single Script

You can combine all the above steps into a single bash script for automation:

#!/bin/bash

LOG_FILE="log_file"
CONNECTORS_FILE="connectors.csv"
FORMATTED_FILE="formatted_connectors.csv"
OUTPUT_FILE="subscription_sources.csv"

# Step 1: Extract unique connectors
grep "failed to create connector to" $LOG_FILE | awk '{print $6}' | sort -u > $CONNECTORS_FILE

# Step 2: Reformat connectors
awk -F'[/|:]' '{print $1 "/" $2 ":" $3}' $CONNECTORS_FILE > $FORMATTED_FILE

# Step 3: Extract subscription sources
grep "Subscription source=" $LOG_FILE | awk -F'[=|]' -v CONN_FILE=$FORMATTED_FILE '
BEGIN {
    while (getline < CONN_FILE) {
        hosts[$1] = 1;
    }
}
{
    for (host in hosts) {
        if ($0 ~ host) {
            print $2 "," host;
        }
    }
}' > $OUTPUT_FILE

echo "Output saved to $OUTPUT_FILE"

Final Notes

Replace log_file with the actual path to your log file.
The final output (subscription_sources.csv) will contain the subscription source and the corresponding host.
Ensure your log file has consistent formatting to avoid parsing errors.

Let me know if you need further clarification or adjustments!

To download files from a Linux server to your local PC, you can use tools like scp (Secure Copy Protocol), rsync, or even sftp. Here’s how you can do it:

1. Using `scp`

scp is a command-line utility that allows you to securely copy files between a local and remote system.

Syntax:

scp username@remote_server:/path/to/remote/file /path/to/local/destination

Example:

Download a file named example.txt from the server to your local desktop:

scp [email protected]:/home/user/example.txt ~/Desktop

Download an entire directory:

To copy a directory and its contents:

scp -r username@remote_server:/path/to/remote/directory /path/to/local/destination

Notes:

Replace username with your Linux server username.
Replace remote_server with the server’s IP address or domain name.
Use the -P flag if the server uses a non-standard SSH port, e.g.:
```
scp -P 2222 [email protected]:/path/to/file ~/Desktop
```

2. Using `rsync`

rsync is another powerful tool for transferring files and directories between systems. It is especially useful for syncing and resuming interrupted downloads.

Syntax:

rsync -avz username@remote_server:/path/to/remote/file /path/to/local/destination

Example:

Download a file:

rsync -avz [email protected]:/home/user/example.txt ~/Desktop

Download a directory:

rsync -avz [email protected]:/home/user/directory ~/Desktop

Notes:

The -a flag preserves file permissions and timestamps.
The -v flag enables verbose output.
The -z flag compresses the data during transfer, making it faster.

3. Using `sftp`

sftp (SSH File Transfer Protocol) is an interactive command-line program for transferring files.

Steps:

Connect to the server:
```
sftp username@remote_server
```
Navigate to the directory containing the file:
```
cd /path/to/remote/directory
```

Use the get command to download the file:

get example.txt /path/to/local/destination

To download an entire directory, use:

get -r remote_directory /path/to/local/destination

Exit the sftp session:
```
exit
```

4. Using `wget` (for HTTP/HTTPS/FTP Servers)

If the file is hosted on an HTTP or FTP server, you can use wget to download it.

Syntax:

wget http://remote_server/path/to/file

Example:

wget http://your.server.com/files/example.txt

Save to a specific directory:

wget -P /path/to/local/destination http://your.server.com/files/example.txt

5. Using `curl` (for HTTP/HTTPS/FTP Servers)

Similar to wget, you can use curl to download files.

Syntax:

curl -O http://remote_server/path/to/file

Example:

curl -O http://your.server.com/files/example.txt

Save to a specific directory:

curl -o /path/to/local/destination/example.txt http://your.server.com/files/example.txt

Tips:

Ensure you have SSH access to the server and the necessary permissions to read the files you want to download.
If you face connection issues, check your network and whether the server’s SSH or FTP ports are open.
Use scp or rsync for secure file transfers over SSH.

Let me know if you need further clarification!

To run the grep and awk command with multiple lines in an interactive command line, you need to properly handle quotes and newlines. Here's how you can execute the command interactively:

Option 1: Use a Single Line with Proper Escaping

If you want to run the whole command in a single line, you need to escape the newlines (\) and properly handle quotes. Here's the single-line version:

grep "Subscription source=" log_file | awk -F'[=|]' -v CONN_FILE=formatted_connectors.csv 'BEGIN { while (getline < CONN_FILE) { hosts[$1] = 1; } } { for (host in hosts) { if ($0 ~ host) { print $2 "," host; } } }' > subscription_sources.csv

Option 2: Use Multiline Command Directly

If you're working in an interactive shell and want to type in the command line by line, you can use the following approach:

grep "Subscription source=" log_file | awk -F'[=|]' -v CONN_FILE=formatted_connectors.csv '
BEGIN {
    while (getline < CONN_FILE) {
        hosts[$1] = 1;
    }
}
{
    for (host in hosts) {
        if ($0 ~ host) {
            print $2 "," host;
        }
    }
}' > subscription_sources.csv

Steps:

Copy the command and paste it directly into the terminal.
After pasting each line, press Enter.
Ensure that the syntax matches exactly as shown, and don't worry about the terminal prompt—it will wait for the closing single quote ' before executing the full command.

Option 3: Save to a Temporary Script

If the multiline syntax is hard to use interactively, save the command to a temporary script file and execute it. Here’s how:

Create a script file:
```
nano extract_sources.sh
```

Paste the following lines into the file:

#!/bin/bash
grep "Subscription source=" log_file | awk -F'[=|]' -v CONN_FILE=formatted_connectors.csv '
BEGIN {
    while (getline < CONN_FILE) {
        hosts[$1] = 1;
    }
}
{
    for (host in hosts) {
        if ($0 ~ host) {
            print $2 "," host;
        }
    }
}' > subscription_sources.csv

Save and exit (press Ctrl+O, then Enter, then Ctrl+X).
Make the script executable:
```
chmod +x extract_sources.sh
```
Run the script:
```
./extract_sources.sh
```

Option 4: Use a Here Document

You can use a "here document" in the shell to handle multiline commands cleanly:

grep "Subscription source=" log_file | awk -F'[=|]' -v CONN_FILE=formatted_connectors.csv <<'EOF' > subscription_sources.csv
BEGIN {
    while (getline < CONN_FILE) {
        hosts[$1] = 1;
    }
}
{
    for (host in hosts) {
        if ($0 ~ host) {
            print $2 "," host;
        }
    }
}
EOF

Explanation:

<<'EOF' starts a here document, allowing you to input multiline text until EOF is reached.
The awk script is written between <<'EOF' and EOF.

Choose the Best Option

For quick one-time execution, use Option 1 (single line).
For better readability or frequent use, save the command as a script (Option 3).
For direct multiline execution, use Option 2 or Option 4.

Let me know if you face any issues!

250123 ‐ linux - cywongg/2025 GitHub Wiki

Step 1: Extract Unique Lines

Step 2: Reformat as CSV

Step 3: Extract Subscription Sources

Step 4: Validate and Review

Optional: Combine All Steps into a Single Script

Final Notes

1. Using scp

Syntax:

Example:

Download an entire directory:

Notes:

2. Using rsync

Syntax:

Example:

Download a directory:

Notes:

3. Using sftp

Steps:

4. Using wget (for HTTP/HTTPS/FTP Servers)

Syntax:

Example:

Save to a specific directory:

5. Using curl (for HTTP/HTTPS/FTP Servers)

Syntax:

Example:

Save to a specific directory:

Tips:

Option 1: Use a Single Line with Proper Escaping

Option 2: Use Multiline Command Directly

Option 3: Save to a Temporary Script

Option 4: Use a Here Document

Choose the Best Option

⚠️ **GitHub.com Fallback** ⚠️

1. Using `scp`

2. Using `rsync`

3. Using `sftp`

4. Using `wget` (for HTTP/HTTPS/FTP Servers)

5. Using `curl` (for HTTP/HTTPS/FTP Servers)

⚠️ GitHub.com Fallback ⚠️