awk: syntax error at source line

awk: syntax error at source line

awk produces a syntax error when the program contains unbalanced braces, missing quotes, or incorrect shell quoting.

When awk Produces This Error

awk displays syntax error at source line 1 or unexpected token when it cannot parse the program text. The error points to the character position where parsing failed.

What Causes Syntax Errors in awk

The most common cause is using double quotes instead of single quotes around the awk program on the command line. The shell interprets $1 inside double quotes as a shell variable (empty), not as an awk field reference.

Unbalanced braces {} and missing semicolons between statements within an action block also cause syntax errors.

How to Fix Syntax Errors in awk

1. Always enclose the awk program in single quotes to prevent shell interpretation:

   awk '{print $1}' file.txt

   Not:

   awk "{print $1}" file.txt

2. Ensure every opening brace has a closing brace and every action ends with a statement separator.

3. Verify the awk implementation supports the syntax used — FPAT is gawk-only.