Advanced Bash−Scripting Guide. An in−depth exploration of by Cooper M.
By Cooper M.
This instructional assumes no prior 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 options. The routines and heavily-commented examples invite energetic reader participation, less than the idea that the single solution to rather examine scripting is to write down scripts.
Read Online or Download Advanced Bash−Scripting Guide. An in−depth exploration of the gentle art of shell scripting PDF
Best electronics: radio books
In Post-Rapture Radio , our trustworthy narrator reveals a mysterious field containing the sermons and magazine entries of a real, unvarnished American personality the Reverend Richard Lamblove. The little-known Lamblove–tried and failed–to revolutionize modern Christian tradition. As his magazine entries, cereal field scribblings, and random notes written on paper scraps demonstrate, Lamblove sees modern tradition as shallow, overly individualistic, and fed on with the type of prestige measured through funds, energy, and famous person.
Considering its inception in 1966, the sequence of numbered volumes often called Semiconductors and Semimetals has wonderful itself in the course of the cautious number of recognized authors, editors, and individuals. The Willardson and Beer sequence, because it is well known, has succeeded in generating a number of landmark volumes and chapters.
This booklet constitutes the completely refereed post-worksop complaints of the eighth foreign Workshop Radio Frequency id: safety and privateness concerns, RFIDSec 2012, held in Nijmegen, The Netherlands, in July 2012. The 12 revised complete papers provided have been conscientiously reviewed and chosen from 29 submissions for inclusion within the publication.
- Antenna Impedance Matching
- Radio Laboratory Handbook - Volume 1, Cables and Antennas
- Mobile Computing und RFID im Facility Management: Anwendungen, Nutzen und serviceorientierter Architekturvorschlag
- ARM cross development with Eclipse version 2
Additional resources for Advanced Bash−Scripting Guide. An in−depth exploration of the gentle art of shell scripting
Is greater than, in ASCII alphabetical order if [[ "$a" > "$b" ]] if [ "$a" \> "$b" ] Note that the ">" needs to be escaped within a [ ] construct. See Example 26−5 for an application of this comparison operator. −z string is "null", that is, has zero length −n string is not "null". The −n test absolutely requires that the string be quoted within the test brackets. Using an unquoted string with ! −z, or even just the unquoted string alone within test brackets (see Example 7−6) normally works, however, this is an unsafe practice.
What is truth? " fi # 0 is true. " fi # 1 is true. " # −1 is true. " fi # NULL is false. " fi # Random string is true. echo echo "Testing \"\$xyz\"" if [ $xyz ] # Tests if $xyz is null, but... # it's only an uninitialized variable. " else Chapter 7. " # Uninitialized variable is false. fi echo echo "Testing \"−n \$xyz\"" if [ −n "$xyz" ] # More pedantically correct. " fi # Uninitialized variable is false. echo xyz= # Initialized, but set to null value. " fi # Null variable is false. echo # When is "false" true?
Compound comparison −a logical and exp1 −a exp2 returns true if both exp1 and exp2 are true. −o logical or exp1 −o exp2 returns true if either exp1 or exp2 are true. These are similar to the Bash comparison operators && and ||, used within double brackets. [[ condition1 && condition2 ]] The −o and −a operators work with the test command or occur within single test brackets. if [ "$exp1" −a "$exp2" ] Chapter 7. Tests 53 Advanced Bash−Scripting Guide Refer to Example 8−3 and Example 26−9 to see compound comparison operators in action.