Linux/Basic commands/awk
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AWK is a language/utility designed and used mainly for text processing.
Basic Examples
[edit | edit source]- Prepend a variable string ($STRING_TO_PREPEND) at the beginning of every line
cat file.txt | awk '{print "'$STRING_TO_PREPEND' "$0}'[1]
In case text to prepend is a variable ($PREPEND_TEXT_VAR):
echo "$ORIGINAL_TEXT" | awk -v AWK_PREPEND_VAR="$PREPEND_TEXT_VAR" '{print AWK_PREPEND_VAR" "$0}'
Prepend time before every line
echo "$ORIGINAL_TEXT" | awk -v time="$(date)" '{print time" "$0}'
- Remove leading spaces at the beginning of a line:
awk ' {$1=$1} 1 '
[2]
- Print line if field value is larger than:
awk '$FIELD_NUMER>VALUE'
- Example:
awk '$4>3.1416'
Activities
[edit | edit source]- Read stackoverflow awk questions: https://stackoverflow.com/questions/tagged/awk?tab=Votes