The "echo" command prints a message to the terminal. Variable interpolation is used to include the values of the 'firstName' and 'lastName' variables in the message. When the script is executed, it prints a message greeting you with your first name and last name. 3. Numeric Variables: W...
You can’t use variables inside the Bash Brace Expansion, instead you will need to use a for loop with a Bash Arithmetic Expression. [me@linux ~]$ start=1 [me@linux ~]$ end=5 [me@linux ~]$ for ((i=start; i<=end; i++)); do echo $i; done 1 2 3 4 5 ...
OperatorsWhat does it do? ! NOT && AND || ORMiscellaneousOperatorsWhat does it do?Example , Comma Separator ((a=1,b=2,c=3))ARITHMETICSimpler syntax to set variables# Simple math ((var=1+2)) # Decrement/Increment variable ((var++)) ((var--)) ((var+=1)) ((var-=1)) # Using...
(dc OPERATOR ARRAY-OF-NUMBERS)- Wraps thedccommand to do decimal math. E.g.(dc '+ [1 2 3])yeilds6. (env [KEY] [VALUE])- Returns ahash-mapof environment variables. Returns the value ofKEYif present. Sets the value ofKEYtoVALif the latter is present. ...
mkdir -p {Math,English,Geography,Arts}_{notes,examresults,portfolio}Here’s the output for it displaying a merge of the two directories:18. Read FilesIn order to read a file in bash, you will need to create a sample file first. Do so with the following command:nano...
# Simple math ((var=1+2)) # Decrement/Increment variable ((var++)) ((var--)) ((var+=1)) ((var-=1)) # Using variables ((var=var2*arr[2])) 三元测试 # Set the value of var to var2 if var2 is greater than var.
pd1.setXm("张"+i++);//(数据类型)(最小值+Math.random()*(最大值-最小值+1))intsex = (int)(1+Math.random()*(2-1+1));if(sex==1) pd1.setXb("男");elsepd1.setXb("女"); pd1.setSr("1991-01-12");returnpd1; }/** 获取类数据*/publicstaticList<PersonData>getPersonDataList...
My environment uses GMT time and not Local time, so i had to do a little math in order to get the hours to be correct. I know it is not elegant and i will have to change the -4 to a -5 here soon, but hey, it works for me. I put the following into my .bashrc f...
Getting command output in variables Parameter expansion forms Specifying default values String chopping Extracting substrings Getting string length Substituting strings Changing case Combining parameter expansion forms Doing math in Bash Fixed or floating-point arithmetic Using globs Configuring globbing behavior...
variables: BASH, BASH_VERSION, BASH_VERSINFO, UID, EUID, REPLY, TIMEFORMAT, PPID, PWD, OLDPWD, SHLVL, RANDOM, SECONDS, LINENO, HISTCMD, HOSTTYPE, OSTYPE, MACHTYPE, HOSTNAME, ENV, PS3, PS4, DIRSTACK, PIPESTATUS, HISTSIZE, HISTFILE, ...