Cooper M.'s Advanced Bash−Scripting Guide. An in−depth exploration of PDF

By Cooper M.

This educational assumes no past wisdom of scripting or programming, yet progresses swiftly towards an intermediate/advanced point of guideline ...all the whereas sneaking in little snippets of UNIX knowledge and lore. It serves as a textbook, a handbook for self-study, and a reference and resource of data on shell scripting recommendations. The routines and heavily-commented examples invite lively reader participation, lower than the idea that the single technique to particularly research scripting is to put in writing scripts.

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Done } #Send each arg that was passed to the script to the linkchk function #if it is a valid directoy. If not, then print the error message #and usage info. " fi done exit 0 Example 29−1, Example 10−7, Example 10−3, Example 29−3, and Example A−2 also illustrate uses of the file test operators. 3. Comparison operators (binary) integer comparison −eq Chapter 7. Tests 48 Advanced Bash−Scripting Guide is equal to if [ "$a" −eq "$b" ] −ne is not equal to if [ "$a" −ne "$b" ] −gt is greater than if ["$a" −gt "$b" ] −ge is greater than or equal to if [ "$a" −ge "$b" ] −lt is less than if [ "$a" −lt "$b" ] −le is less than or equal to if [ "$a" −le "$b" ] < is less than (within double parentheses) (("$a" < "$b")) <= is less than or equal to (within double parentheses) (("$a" <= "$b")) > is greater than (within double parentheses) (("$a" > "$b")) >= is greater than or equal to (within double parentheses) (("$a" >= "$b")) string comparison = is equal to if [ "$a" = "$b" ] == is equal to if [ "$a" == "$b" ] Chapter 7.

The escape also provides a means of writing a multi−line command. Normally, each separate line constitutes a different command, but an escape at the end of a line escapes the newline character, and the command sequence continues on to the next line. Chapter 5. Quoting 36 Advanced Bash−Scripting Guide (cd /source/directory && tar cf − . ) | \ (cd /dest/directory && tar xpvf −) # Repeating Alan Cox's directory tree copy command, # but split into two lines for increased legibility. # As an alternative: tar cf − −C /source/directory .

Com> # Used with permission. Chapter 7. Tests 47 Advanced Bash−Scripting Guide #A pure shell script to find dead symlinks and output them quoted #so they can be fed to xargs and dealt with :) #eg. *$/"/g' # #but that wouldn't be pure bash, now would it. #Caution: beware the /proc file system and any circular links! ############################################################## #If no args are passed to the script set directorys to search #to current directory. Otherwise set the directorys to search #to the agrs passed.

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Advanced Bash−Scripting Guide. An in−depth exploration of the gentle art of shell scripting by Cooper M.


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