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CHAPTER 24 TEXT-PROCESSING ONE-LINERS
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You have to escape all characters that have a special meaning, such as !, @, #, %, ^, ., *, and so on. This example shows how to escape a period:
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some_var=`echo $some_var | sed -e s/\\\./\\\\\\\./g` some_var=`echo $some_var | sed -e s/[.]/\\\\\\\./g`
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To escape the dollar sign, use the following code:
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some_var=`echo $some_var | sed -e s/\\\\\$/\\\\\\\\$/g` some_var=`echo $some_var | sed -e s/[$]/\\\\\\\\$/g`
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The following lets you escape the ampersand or parenthesis:
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some_var=`echo $some_var | sed -e s/\&/\\\\\\\\\&/g`
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To escape forward slashes you use the following code:
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some_var=`echo $some_var | sed -e s/\\\\\//\\\\\\\\\\\//g` some_var=`echo $some_var | sed -e s/[/]/\\\\\\\\\\\//g`
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The longest and ugliest of all is escaping backslashes, because you re trying to escape the escape character. The syntax with the square brackets doesn t work in this case and you re left with seven consecutive backslashes as the search string.
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some_var=`echo $some_var | sed -e s/\\\\\\\/\\\\\\\\\\\\\\\/g`
Returning Trailing Lines from a Pattern Match Using grep
It s easy to grab certain lines from a file or output identified by running grep with a regular expression. What isn t quite so simple is getting lines that follow the lines matching the grep search expression. Consider a log file in which a particular entry precedes the record of a certain type of sequence of events, and you want to grab both the initial entry and the sequence that follows from the log. The following awk command performs the task by searching for a line containing the STRING that identifies the initial entry. The getline command can then be used to get the next line of the input. Several getline statements with a print statement between each could be used to retrieve more than one line. You can print each retrieved line, or any field or range of fields within it. This example shows a print statement applying to only the first field of the two lines following the initial line that contains the STRING:
some_command_output | awk ' $1 ~ /^STRING/ \ { getline;print $1;getline;print $1}'
If you want to omit printing selected lines, you would perform several getline commands in a row without a print in between. Note that STRING is preceded by a caret, ^. This forms a regular expression specifying that STRING occurs at the beginning of the string being matched, $1 in this case. This
CHAPTER 24 TEXT-PROCESSING ONE-LINERS
match works if you want to find text that starts with STRING, possibly followed by additional text. If you want to match STRING exactly, you can add $ to the end of the regular expression to specify the end-of-line character, like so: /^STRING$/. To match STRING anywhere in the line, remove both the ^ and the $. The current GNU grep utility has the ability to return an arbitrary number of lines following a matching search already built in. This feature is accessed using the -A switch.
Returning Preceding Lines to a Pattern Match Using grep
This technique is a bit more involved, as you need to cache previous lines and print them out when necessary. I outline three examples here, each more complex than the previous one. The first command searches through the file for the pattern string. As it processes each line of the file, it saves the line prior to the match, and its record number, in the variables p0 and pNR, respectively. (The awk internal variable NR represents the number of records in the current line of input.) When a line containing the pattern string is found, the record number of the previous line (pNR) and the previous line itself (p0) are displayed. Here the record number is simply used to display the number of the line that is being output.
awk '/pattern/{print pNR, p0}{pNR=NR;p0=$0}' /some/file
The next example works in almost the same way except that it saves and prints the two lines preceding each line that matches the pattern string.
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