$ hello_world="value" # Create the variable name. $ var="world" $ ref="hello_$var" # Print the value of the variable name stored in 'hello_$var'. $ printf '%s\n' "${!ref}" value 或者,在bash4.3+上: $ hello_world="va
echo "numberTwelve variable is greater than 12" else echo "neither of the statemens matched" fi 输出如下: [zexcon@fedora ~]$ ./learnToScript.sh numberTwelve variable is equal to 12 你所看到的是if语句的第一行,它在检查变量的值是否真的等于12。如果是的话,语句就会停止,并发出numberTwelve is...
Each time $RANDOM is used, a different integer between 0 and 32767 is returned. This variable should not be used for anything related to security (this includes encryption keys etc)."$RANDOM"INFORMATION ABOUT THE TERMINALGet the terminal size in lines and columns (from a script)...
‘item2’, and ‘item3’. We then use a ‘for’ loop to iterate through each element in the array. The"${array[@]}"syntax is used to access all elements in the array. For each iteration, the current element’s value is stored in theivariable, which we then print out using theec...
[zexcon@fedora~]$./learnToScript.shnumberTwelvevariableisequalto12 1. 2. 你所看到的是 if 语句的第一行,它在检查变量的值是否真的等于 12。如果是的话,语句就会停止,并发出 numberTwelve is equal to 12 的回显,然后在 fi 之后继续执行你的脚本。如果变量大于 12 的话,就会执行 elif 语句,并在 fi...
/bin/bash## Name: test-bucket-1## Purpose:# Performs the test-bucket number 1 for Product X.# (Actually, this is a sample shell script,# which invokes some system commands# to illustrate how to construct a Bash script)## Notes:# 1) The environment variable TEST_VAR must be set# (...
aws_eks_ami_create.sh - creates a custom EKS AMI quickly off the base EKS template and then running a shell script in it before saving it to a new AMI. See also HariSekhon/Packer for more advanced build aws_kms_key_rotation_enabled.sh - lists AWS KMS keys and whether they have key...
# Loop from 0-100 (no variable support).foriin{0..100};doprintf'%s\n'"$i"done 循环遍历可变数字范围 替代seq。 # Loop from 0-VAR.VAR=50for((i=0;i<=VAR;i++));doprintf'%s\n'"$i"done 循环数组 arr=(apples oranges tomatoes)# Just elements.forelementin"${arr[@]}";doprintf'%s...
# Create the variable name. $ var="world" $ ref="hello_$var" # Print the value of the variable name stored in 'hello_$var'. $ printf '%s\n' "${!ref}" value 1. 2. 3. 4. 5. 6. 7. 8. 9. 或者,在bash4.3+上:
Theset -eis used to exit the code in case of a command error, then the script gets getting filename as user input. Theread -rcommand reads the file and stores the strings to thelinevariable. Next, theecho $linedisplays the lines to the standard output. Lastly, thefilenamevariable is ...